Casio CMT-S20R-AS User manual

1
MA2110-C
Motion Sensor
User’s Guide
Thank you for purchasing this Motion Sensor (sensor unit).
Before use, be sure to read the “Safety Precautions” in this manual. Use this sensor unit correctly.
CMT-S20R-AS
2021
EN
Note the following to ensure proper use.
Ɣ Recommended ages: 14 and above
• Correct measurements may not be possible for individuals whose
height and/or frame is significantly different from average.
Ɣ Applicable activity: Outdoor long-distance running
• Correct measurements may not be possible in the case of short-
distance running or similar types of running. This sensor unit is not
suitable for running on rough terrain, on hills, or on other uneven
surfaces.
Ɣ Attachment:
See step 6 under “Starting Measurement”.
• Be sure to wear the sensor unit with its clip (logo side) facing
outwards. Lock the sensor unit in place so it is vertically upright and
at the center of the small of your back.
• If you are wearing a pouch or other accessories, take care that
they do not come into contact with the sensor unit.
Subjecting the sensor unit to impact can make correct measurement
impossible.
Unpackaging.................................... 2
Read this first! ................................. 2
General Guide.................................. 2
Charging........................................... 3
Configuring Initial Settings............. 4
Installing the Runmetrix App on
Your Phone..................................... 4
Registering the Runmetrix App
(Pairing).......................................... 4
Sensor Unit Measurements............ 6
Attaching the Sensor Unit Cover .... 6
Turning On Power........................... 7
Receiving GPS Signals................... 7
Starting Measurement .................... 7
Stopping Measurement................... 9
Turning Off Power........................... 9
Status Indication Table................. 10
Troubleshooting............................ 11
Main Specifications....................... 11
Safety Precautions........................ 12
Handling Precautions.................... 16
Water Resistance........................... 16
Operating Precautions.................. 17
Power Supply................................. 20
Charging....................................... 20
Battery Use Precautions............... 20

2
Unpackaging
When unpackaging, check to make sure that all of the items below are included. If
something is missing, contact your original retailer.
• Sensor unit (CMT-S20R-AS)
• USB cable
• Sensor unit cover
Read this first!
• To use this sensor unit, you need to install the Runmetrix app on your
smartphone. For information about the Runmetrix app, visit the CASIO
website.
• Use this sensor unit and its accessories only as directed.
• The contents of this User’s Guide are subject to change without notice.
• Every effort is made to ensure that the contents of this manual are accurate
and up to date. Should you notice something that requires our attention, please
contact us.
• Any reproduction of the contents of this manual, either in part or its entirety,
is prohibited. You are allowed to use this manual for your own personal use.
Any other use without the permission of CASIO COMPUTER CO., LTD. is
forbidden under copyright laws.
• CASIO COMPUTER CO., LTD. shall be held in no way liable for any lost
profits or claims from third parties arising out of the use or malfunction of this
product.
• CASIO COMPUTER CO., LTD. shall be held in no way liable for any lost
profits or claims from third parties arising out of the use of the Runmetrix app.
• CASIO COMPUTER CO., LTD. shall be held in no way liable for any loss
or lost profits due to loss of memory contents caused by malfunction or
maintenance of this product or any other reason.
• The illustrations in this manual may differ from the actual sensor unit.
General Guide
  
 



[] lamp 
Button  LED

Slide lock (2-step lock mechanism) 
Clip  [USB] cover

USB port
• Remove all instructional stickers from the sensor unit before using it.

3
Charging
This sensor unit is powered by a built-in rechargeable lithium-ion battery. Note
that the built-in battery is not charged when the sensor unit is shipped from the
factory.
After purchase, you need to charge the sensor unit using its USB port.
Ɣ Charging from a computer’s USB port
With sensor unit power turned off, connect and .
Charging time: Approximately three hours
USB 

USB port
USB port
Computer
(Power turned on.)
[] lamp
Lit red: Charging
Unlit: Charging complete
USB cable
(included)
Ɣ Charging from a non-computer device’s USB port
You can charge the sensor unit from a USB port (Type-A) that complies with
USB standards.
✹IMPORTANT!
• The following conditions can cause charging to take longer than expected:
Not charging the battery for a long time or using certain types of computers or
connection environments.
• Make sure the USB cable connectors are correctly oriented when plugging
them in. Do not try to force connectors into ports.
• There are prescribed specifications required for devices and power supply
devices that can be used for USB charging. Do not use an inferior adaptor or
device that does not meet the required specifications. Doing so creates the risk
of malfunction and failure of the sensor unit.
• Note that use of a USB-AC adaptor may be subject to local standards imposed
by the country where you are using it.
• CASIO COMPUTER CO., LTD. shall be held in no way liable for any
malfunction or failure of the sensor unit caused by use of an inferior adaptor or
an adaptor that does not meet required specifications.

4
Configuring Initial Settings
To use this sensor unit for run data measurement, you need to install the
Runmetrix app on your smartphone.
After installing the Runmetrix app on your smartphone, you should input your user
name, gender, and other personal data with the app and register your sensor unit.
For information about the Runmetrix app, visit the CASIO website.
Installing the Runmetrix App on Your Phone
Go to Google Play or the App Store, search for the Runmetrix app, and then
install it on your phone.
On Google Play or the App Store, check the required OS version (Android or
iOS) for the Runmetrix app.
App Operation Guarantee
CASIO COMPUTER CO., LTD. makes no guarantees as to the ability of the
Runmetrix app to run on any particular smartphone or tablet.
✹IMPORTANT!
• The functions and required operating environment of the Runmetrix app are
subject to change without notice.
Registering the Runmetrix App (Pairing)
✹IMPORTANT!
• This sensor unit must be paired with a smartphone in order to use it. Be sure to
pair the sensor unit with a smartphone before trying to use it.
• Turning on the sensor unit after purchasing it will cause its LED to flash red,
indicating that the sensor unit is not paired with a phone.
• Only one phone at a time can be connected with this sensor unit.
• Some phone models may not work with this sensor unit.
• If the sensor unit is already registered to the app, attempting to re-register the
sensor unit will cause the app to temporarily delete the existing registration and
then re-register the sensor unit.
• Use the Runmetrix app to configure sensor unit settings.
• Turn on the Bluetooth setting of your phone and then perform the following
operations.
1. On your phone, start up the Runmetrix app.
2. In Runmetrix, tap “Create new account” and create a new
account.
• If you have already obtained a CASIO ID with another CASIO product, log
in and configure your profile settings.
3. Use Runmetrix to input your user name and other basic
information, and then tap “Register”.
4. Check to make sure that the sensor unit is turned off.
• If the sensor unit is turned on, press and hold the sensor unit button for
about two seconds to turn it off.

5
5. Hold down the sensor unit button for about five seconds, and
then release it.
Holding down the button will cause the sensor unit to beep twice as power
turns on. Keep the button depressed until the sensor unit’s LED flashes
between orange and green. Release the button once the flashing starts. Note
that if you keep the button depressed too long after the flashing starts, the
sensor unit will beep again and the LED will flash between orange and green
at high speed. This is the watch pairing mode. If you enter the watch pairing
mode by mistake, release the sensor unit button and then hold it down again
to turn off power. Next, perform step 5 again.
Pairing with a Watch
• Only one watch at a time can be connected with this sensor unit.
• Pairing the sensor unit with a compatible watch makes it possible to use
the watch to perform sensor unit operations and monitor measurements in
real-time.
To pair the sensor unit with a watch
1. Put the watch into its sensor pairing mode.
2. Hold down the button of the sensor unit for about seven seconds to
enter its pairing mode.
• Holding down the button of the sensor unit will cause the sensor unit
to beep twice as power turns on.
3. Keep the button depressed, and the sensor unit’s LED will start to flash
between orange and green.
4. Keep the button depressed until the sensor unit beeps again and the
LED flashes between orange and green at high speed.
5. Release the button.
• For more information on pairing with your watch, see your watch’s
user’s guide.
6. In the Runmetrix app, tap “Start registration”.
When the registration of the sensor unit is complete and the sensor unit is
Bluetooth paired with a phone, the top Runmetrix screen will appear on the
phone.
• Turning off the sensor unit will terminate its connection with your phone.

6
Sensor Unit Measurements
✹IMPORTANT!
• If you do not start measurement within about 60 minutes after turning on the
sensor unit, it will turn off automatically. The “Automatically turn off (auto power
off)” setting can be changed with the Runmetrix app.
• You can use the Runmetrix app to check the remaining battery charge and the
remaining recording capacity.
• Remove the instructional sticker from the sensor unit before using it.
• Leaving the sensor unit on a hot surface or leaving it exposed to direct sunlight
for long periods can cause the sensor unit to turn off automatically.
• Do not use the sensor unit while it is being charged using a mobile battery.
Doing so can cause incorrect measurement results.
Attaching the Sensor Unit Cover
1. Attach the sensor unit cover.
Unlock the slide lock of the sensor unit by sliding it upwards.
Slide lock
With the clip open, insert the sensor unit into the sensor unit cover, [USB]
cover end first.
Sensor unit
cover
[USB] cover
Insert the button side of the sensor unit into the sensor unit cover.
• Wrap the sensor unit cover over one corner of the sensor unit and then
over the other corner.
Make sure that the [USB] cover, [ ] lamp, button, and LED of the sensor
unit are not covered.
✹IMPORTANT!
• Attaching the sensor unit without the sensor unit cover can result in skin
irritation due to friction. Attach the sensor unit cover before use.

7
Turning On Power
2. Hold down the sensor unit button for about two seconds.
Holding down the button will cause the sensor unit to beep twice. Next, the
sensor unit’s LED will light either green or orange. Release the button at this
time. Release the button at this time. This turns on power.
• If the LED lights red for about two seconds, it means that remaining battery
power is low. Charge the sensor unit. Use the Runmetrix app to check the
remaining battery charge.
Receiving GPS Signals
3. To receive GPS signals, you should be outdoors in a location
where the sky is visible and not blocked by buildings, trees, or
other objects. Stop moving and hold the sensor unit with its
clip side facing upwards. The sensor unit LED will light green
when signal reception is complete.
YES NO
• The receive operation may take longer if you try to receive GPS signals
while in motion.
• You can check the status of GPS reception by checking the sensor unit’s
LED.
Lit orange: Receiving
Lit green: Reception complete
• You can shorten the time required for GPS reception by sending GPS
assist data to the sensor unit from the Runmetrix app in advance. For
details about how to do this, visit the CASIO website.
✹IMPORTANT!
• The sensor unit stores location information in its memory. To protect your data,
take care not to lose the sensor unit.
NOTE
• Under some reception conditions, it may take several minutes to receive GPS
signals.
• Atmospheric conditions and your usage environment can affect location
measurement.
• The following conditions can reduce the accuracy of GPS measurements or
make measurement impossible.
– Indoors or in other locations where the sky is not visible
– Near equipment that emits strong radio waves
– The following locations, where signals are being blocked: near trees or
buildings, in crowds
• Measurement can be started even if GPS signals cannot be received for some
reason. In such a case, certain reception environments may result in location
information not being recorded or large error.
• This sensor unit is compatible with GPS (United States), QZSS (Japan), and
GLONASS (Russia). In this manual, “GPS” refers to all supported positioning
systems.
Starting Measurement
4. Press the sensor unit button once.
Release the button when you hear a beep. The LED will flash green or
orange, and measurement will start.
• Be sure to check for flashing of the LED before mounting.
5. Slide the clip slide lock upwards to
unlock it. Slide lock

8
6. Clip the sensor unit to your running pants.
✹IMPORTANT!
• To keep the sensor unit from shaking while running, wear your running pants
with the upper part of the waistband above your hipbone. Sufficiently tighten
the drawstring of your running pants or wear pants with a tight waist.
• Be sure to wear the sensor unit with its clip (logo side) facing outwards.
Lock the sensor unit in place so it is straight vertical and at the center of the
small of your back.
• Attach the sensor unit at the height that is in line with your hip bone.
Hip line
Waist center line
Clip facing
outwards
• To keep the sensor unit from slipping while running, clip it firmly onto the
elastic or drawstring of your running pants. Do not use the sensor unit with
running pants that have a wide distance between their rubber waistband or
drawstring and top edge.
• Take care not to pinch your fingers with the clip.
• If you are wearing a pouch or other accessories, take care that they do not
come into contact with the sensor unit. Subjecting the sensor unit to impact
can make correct measurement impossible.
• Do not attach the sensor unit as shown below. Doing so will result in
inaccurate measurement.
At an angle Off-center
Not fully clipped Clip side towards your body
Front of your body or not at the waist Loose running pants drawstring
NO NO
NO NO
NO NO

9
7. Slide the clip slide lock downwards to lock it.
The slide lock uses a 2-step lock mechanism. If your running pants are too
thick to push the slide lock all the way in, stop the slide lock when you feel the
first click (1-step lock).
✹IMPORTANT!
• When locking the clip, do not use excessive force to press the slide lock in.
Doing so creates the risk of damage to the sensor unit and your running pants.
• The sensor unit can fall off of your running pants if it cannot be secure using
the slide lock for some reason. Be sure to wear running pants that allow you to
lock the slide lock.
2-step lock 1-step lock
8. Start running.
✹IMPORTANT!
• Ongoing measurement will stop if the battery goes dead.
Before starting measurement, use the Runmetrix app to check the battery
level, and charge the battery if necessary.
• If the memory becomes full during measurement, the oldest data will be
deleted to make room for the new data. Before starting a measurements, you
can use the Runmetrix app to check the remaining recording capacity and
transfer data to the app if necessary.
• You can use the Runmetrix app to enable or disable the “Auto Pause” setting.
(Initial Default: Disabled)
• You can use the Runmetrix app to change the “Auto Lap” setting. (Initial
Default: 1 km)
• The sensor unit will turn off automatically if it becomes hot.
Stopping Measurement
9. Slide the clip slide lock upwards to unlock it.
10.
Remove the sensor unit from your running pants.
✹IMPORTANT!
• Do not attempt to remove the sensor unit from your running pants while the clip
is locked with the slide lock. Doing so creates the risk of damage to the sensor
unit and your running pants. Release the slide lock before removing the sensor
unit from your running pants.
11.
Press the sensor unit button twice in succession (double-click).
Release the button when you hear a beep, and the LED changes from
flashing to lit. This indicates that measurement is stopped.
• Measurement data is transferred to your phone and then automatically
uploaded to the server. Depending on contract conditions with your service
provider, this operation may cause normal communication charges to be
incurred by you.
• To restart measurement, perform steps 4 through 8 of the above
procedure.
Turning Off Power
12.
Hold down the sensor unit button for about two seconds.
Keep the button depressed until you hear one beep, and then, two seconds
later, two more beeps. This indicates that power is turned off.
• If the LED lights red for about two seconds, it means that remaining battery
power is low. Charge the sensor unit. Use the Runmetrix app to check the
remaining battery charge.

10
Status Indication Table
The current status of the sensor unit is indicated by whether the LED and the [ ]
lamp are lit or flashing.
Power
On Pairing
Charging
GPS
Receive
Measuring Measuring
Paused
Power
Off
LED
Orange
Lit — — —
Receiving
GPS
———
Fast
flashing ————
Measuring
and
receiving
GPS
——
Slow
flashing —————
Measuring
paused
and
receiving
GPS
—
Green
Lit — — —
GPS
receive
complete
———
Fast
flashing ————
Measuring
and GPS
receive
complete
——
Slow
flashing —————
Measuring
paused, and
GPS receive
complete
—
Red
Lit
Battery
level
25% or
less
—————
Battery
level
25% or
less
Unlit — ——————
Fast
flashing Internal error ——————
Slow
flashing
Unpaired ———
Memory
full error Memory full error —
Orange/green
Fast
flashing —
Pairing
with
watch
mode
—————
Slow
flashing —
Pairing
with
phone
mode
—————
[] lamp
Red
Lit — —
Charging ————
Unlit — —
Charging
complete
————
Flashing ——
Charging
error
————

11
Troubleshooting
• If the sensor unit operation becomes abnormal during use, hold down its
button for about 15 seconds to reset it. This will initialize the sensor unit
without affecting measurement data.
– During the 15 seconds you are holding down the sensor unit button, the
sensor unit may beep, and the LED will turn on and off. Keep the button
depressed.
– There is no sound to let you know that the reset operation is complete.
• If you cannot receive GPS signals even though you are in an open area, hold
down the sensor unit button for about 15 seconds to reset and then try again.
If you still cannot receive signals, contact your local CASIO Service Center.
• If the LED flashes red at high speed when you turn on the sensor unit, it may
mean there is some internal problem. Contact your local CASIO Service
Center. Note that the current status of the sensor unit is indicated by the
flashing speed (fast or slow) of the LED.
Main Specifications
Notification Functions Bluetooth®5.0 (Low Energy)
External Connection
Port Micro USB port (USB charging)
Built-in Sensors 9-Axis sensor (acceleration, gyro, magnetic),
barometric pressure
GPS GPS, GLONASS, QZSS
Recording Capacity
Approximately 200 km (depending on usage conditions)
Power Supply Rechargeable lithium-ion battery (built-in)
Battery Life Approximately 20 hours (continuous use at 25°C)
Sensor Unit
Dimensions 39.9 (W) × 62.1 (H) × 18.2 (D) mm 43.7 (W) × 63.6 (H) × 19.6 (D) mm
(Including sensor unit cover)
Weight Approximately 37 g
Approximately 44 g (Including sensor unit cover)

12
Safety Precautions
Before use, be sure to read the “Safety Precautions” sections of this User’s
Guide. Use this device as instructed.
DANGER Indicates something that creates the major risk of
death or serious personal injury.
WARNING Indicates something that creates the risk of death
or serious personal injury.
CAUTION Indicates something that creates the risk of minor
personal injury or physical damage.
Symbol Examples
The /symbol indicates something that requires caution.
(Symbol to the left means “electrical shock caution.”)
The -symbol indicates something you should not do.
(Symbol to the left means “Do not disassemble.”)
The 0symbol indicates something you must do.
(Symbol to the left means “Unplug the power plug.”)
*DANGER
Rechargeable Battery
Charge the battery using only the method specifically
described in user documentation.
Use of another method creates the risk of battery overheating, fire,
and rupture.
Do not expose this product to fire or heat.
Doing so creates the risk of explosion resulting in fire and personal
injury.
*WARNING
Abnormalities (Smoke, Odor, Heat Generation, etc.)
Do not use the product if it is emitting smoke, odor, heat, or
exhibiting any other abnormality. Do not use the product after
it has been dropped or otherwise damaged.
Doing so creates the risk of fire and electric shock. Immediately
perform the steps below.
1. Turn off power. If you are unable to turn off power, reset the
sensor unit.
2. Contact your original retailer or a CASIO Service Center.
*
*
*

13
Charging from a Computer
To protect against fire and electric shock, be sure to observe
the following precautions.
• Do not plug into an overloaded extension cord or power outlet.
• Do not cover the USB cable with a blanket or other material
during use, and keep it away from heating devices.
• Use only the specified type of USB cable.
• Use the included cables with this product only.
• Do not place heavy objects on the USB cable and do not bundled
it with cables.
• Do not subject a USB cable to heat or attempt to modify it, and
avoid damaging it.
• Do not subject the USB cable to excessive bending, twisting, or
pulling.
• Take care not to trip over or to kick cords.
• Do not touch the plug with wet hands.
Doing so creates the risk of electric shock.
• Should the cable become damaged, contact your original retailer
or a CASIO Service Center.
Continued use creates the risk of fire and electric shock.
• Use in an area where there is no risk of being splashed by
liquids.*
Liquids create the risk of fire and electric shock.
* Avoid water, sports drinks, seawater, animal or pet urine, and
other liquid.
• Do not place vases or other containers of liquid on top of cables.
Water creates the risk of fire and electric shock.
• In the case of a lightning storm, do not touch the device plugged
into the power outlet.
Lightning creates the risk of electric shock.
• Before going out, disconnect cables from devices and locate the
product in a place away from animals and pets.
Pet chewing or urine can cause shorting, which creates the risk
of fire.
Avoid Foreign Matter
Take care to keep metal filings and other foreign matter from
getting into the product. Should any foreign matter get into the
product, immediately take the following steps.
Continued use creates the risk of fire and electric shock.
1. Turn off power. If you are unable to turn off power, reset the
sensor unit.
2. Contact your original retailer or a CASIO Service Center.
Disassembly and Modification
Do not attempt any disassembly or modification.
For any internal inspection, adjustment, or repair, contact your
original retailer or a CASIO Service Center.
Doing so creates the risk of electric shock, burn injury, and personal
injury.
Do not drop the product or subject it to impact.
Do not use the product after it has been dropped or damaged.
Should the product become damaged, immediately take the
following steps.
Continued use creates the risk of fire and electric shock.
1. Turn off power. If you are unable to turn off power, reset the
product.
2. Contact your original retailer or a CASIO Service Center.

14
Effect on Other Electronic Devices
Should you notice radio interference or other problems on
other devices is being caused while using this product, do not
use the wireless function.
Radio waves can affect the product and create the risk of accident
due to malfunction.
When using the product in a medical facility or aircraft, follow
the instructions of local personnel and crew concerning use of
such devices.
Do not use the product in an area where use of such devices is
prohibited.
Electromagnetic waves and other signals emitted by this product
may affect measuring instruments and create the risk of accident.
Do not use the product in the vicinity of high-precision
electronic equipment or any electronic equipment that handles
weak signals.
Doing so can cause misoperation and other problems in the
electronic equipment, and creates the risk of accident.
Keep this product away from the chest area of any individual
fitted with a cardiac pacemaker.
Cardiac pacemakers and similar devices can be affected by
electromagnetism. Should anyone fitted with a cardiac pacemaker
or other medical device ever experience any abnormality, move the
product away and contact a physician.
Turn off this product when on a train or in any other crowded
location.
When near a person wearing a cardiac pacemaker or other medical
devices, radio waves may affect such devices and cause them to
malfunction, creating the risk of accident.
Locations for Use and Storage
Do not place the product on an unsteady platform, on a high
shelf, or in any other unstable location.
Dropping and tipping over creates the risk of personal injury.
Do not store or use the product in any of the locations
described below.
Doing so creates the risk of fire and electric shock.
• Areas subjected to large amounts of moisture and dust
• Food preparation areas, near a humidifier, or in areas where the
product is exposed to oil smoke or water vapor
• Near a heating device, on an electric carpet, in a location
exposed to direct sunlight, in a car parked outside, or any other
area where the product is subjected to high temperatures.
Using this Sensor Unit
Do not look at your phone while you are in motion.
Doing so creates the risk of falling over and traffic accident.
Built-in Rechargeable Battery
If a battery is not charged even if the specified charging time is
exceeded, stop charging.
Failure to do so creates the risk of battery overheating, fire, and
rupture.

15
*CAUTION
USB Cable
To protect against fire and electric shock, be sure to observe
the following precautions.
• Do not use detergent to clean the cable (especially around the
jack).
• If you do not plan to use the product for a long period, disconnect
the cable.
Connections
Connect only specified devices and items to connectors.
Connecting to other devices and items creates the risk of fire and
electric shock.
Using this Product
Keep within the limitations of your physical condition and
strength when exercising.
Over-exercising may cause you to feel unwell, and creates the risk
of accident or personal injury.
Wearing This Product
Be sure to attach the sensor unit cover before wearing the
sensor unit.
Sensitive skin, your current physical condition, or how you are
wearing the product can results in pain, rash, or some other
abnormality. If this happens, it is recommended that you wear a
shirt, use tape, or use some other countermeasure to keep the
product from coming into direct contact with your skin. Should
you ever notice any skin abnormality, immediately stop using the
product and consult with a physician.
USB Cover
Do not use this product with the [USB] cover open.
Doing so can allow sweat and other moisture to get into the product
and cause the battery to ignite.

16
Handling Precautions
Ɣ This product is a precision device. Apply excessive force to this product can
cause malfunction or damage. Note the following points.
• When carrying the product in a travel bag, take care that other items in the
bag do not apply excessive force on the product.
• Note the following points when sitting down while wearing this product.
– Do not allow the product to come into contact with nearby objects.
– Do not put weight on the product.
• Do subject the product to dropping or other strong impact.
Ɣ Do not use the product with the sensor unit cover attached inside out. Also, do
not store the product with the sensor unit cover attached inside out.
Water Resistance
• Water Resistance
The waterproof performance of this product is compliant with JIS / IEC
Waterproof Protection Class 7 (IPX7).
✹IMPORTANT!
• The waterproof performance of this product is based on CASIO test
methods. No guarantees are made concerning damages, o product failure or
performance.
. Water Resistance Precautions
The waterproof performance of this product is compliant with IPX7. Note the
following points.
• Check to make sure that there is no dust, sand or other foreign matter on the
waterproof seal of the [USB] cover and the seal contact surface. If necessary,
remove all foreign matter with a clean, dry, soft cloth. Even a single hair, grain
of sand, or other minute object creates the risk of leaking.
• Check to make sure that the waterproof seal of the [USB] cover is not cracked
or scratched.
• Close the [USB] cover tightly.
• Do not open or close the [USB] cover while near water or in a place exposed to
sea winds. Do not open or close the [USB] cover with wet hands.
• Do not leave the product for long periods in a location subjected to low
temperatures to temperatures of 40°C or higher. In particular, avoid locations
exposed to strong direct sunlight, the inside of an automobile parked in the
sun, etc. Such conditions will deteriorate water resistance performance.
. Moisture Precautions
• Use a clean, dry, soft cloth to wipe all water droplets and dirt from the product
before opening the [USB] cover.
• When the [USB] cover is open, water droplets can form on its inner surface.
If there are water droplets on the product, be sure to wipe it dry before use.
. User Maintenance After Use
If sand or mud gets on the product or its sensor unit cover, or if they become wet
with water or sweat, keep the [USB] cover tightly closed and use the steps below
to wipe the product.
• To clean the product, remove the sensor unit cover and then wipe the product
with a clean, dry, soft cloth. Some moisture may remain on the [USB] cover
even after you wipe it, so leave the product with the [USB] cover open in a
shaded, well-ventilated location to dry completely.
• To clean the sensor unit cover, remove it from the product and then wash it
with water. Next, wipe the cover with a clean, dry, soft cloth, and leave the
product with the [USB] cover open in a shaded, well-ventilated location to dry
completely. Note that forcibly pulling on the [USB] cover can damage it.
✹IMPORTANT!
• Do not swing the product around to remove water or try to speed up drying
with a dryer or other device.
• Do not wash the product in a washing machine.

17
. Precautions After Use
• Do not leave the product in locations subjected to high temperature (40°C or
KLJKHURUORZWHPSHUDWXUHVOHVVWKDQí&'RLQJVRPD\GHWHULRUDWHZDWHU
resistance performance.
• Do not use chemicals for cleaning, rust prevention, anti-fogging, etc. Doing so
may deteriorate water resistance performance.
• To maintain resistance performance, it is recommended that you have the
waterproof seals at least once a year. Note that you will be charged for seal
replacement. To have waterproof seals replaced, contact a local authorized
CASIO Service Center or your original retailer.
. Other Precautions
• The USB cable that comes with this product is not water-resistant.
• Subjecting the product to extreme impact creates the risk of deterioration of
water resistance performance.
• In cold regions, water droplets on the product may freeze. Using the product
with frozen water on it may cause malfunction. Do not leave the product with
water droplets on it.
• CASIO COMPUTER CO., LTD. shall be held in no way liable for damage to
internal components of the sensor unit (rechargeable battery, etc.) due to
exposure to moisture caused by improper handling.
• CASIO COMPUTER CO., LTD. shall not be held responsible for any problems
arising out of the submersion of this product in water.
Operating Precautions
. Chemicals
Note that any of the following coming into contact with the product can cause
discoloration or damage: thinner, gasoline, solvents, fats, oils, or cleaners
containing these agents; adhesives, paints, chemicals, insect repellent,
sunscreens, cosmetics, or other similar agents,
. Communication Environment
This product can be used after connecting to a smartphone using Bluetooth
wireless technology. The product may not connect with a phone if it is gripped in
your hand or covered.
. Usage Environment
• $PELHQWWHPSHUDWXUHíWR&
Do not use this product in environments outside the ambient temperature
range. Attempting to do so will cause the product to malfunction.
• Due to battery characteristics, use in a cold location will shorten the battery life,
even if the battery is fully charged.
• Ambient humidity: 10 to 85% RH (no condensation)
• Do not leave the product in the following locations.
– Locations exposed to direct sunlight, or high humidity, dust or sand
– Locations subjected to temperature and humidity extremes, such as near air
conditioning equipment
– Inside an automobile during the day, or in a location subjected to strong
vibration
• Do not use or store this product near equipment that generates strong
electromagnetism or radiation, or a magnetic field.

18
. Condensation
Coming into a heated room from the cold outdoors or moving to a location with
a large temperature difference may cause water droplets (condensation) to form
inside or outside of the product, causing malfunction. To prevent condensation,
seal the product in a plastic bag and allow it to acclimatize to the current ambient
temperature. Next, remove it from the plastic bag and leave it unused for several
hours.
. User Maintenance
If the product becomes dirty, wipe it with a soft, dry cloth.
. Opening the [USB] Cover
Attempting to close the [USB] cover with one hand,
can cause it to float up. Use both thumbs to press the
[USB] cover evenly on the left and right to close it.
. Wireless Function (Bluetooth) Precautions
• Since this product uses wireless communication, it may affect or be affected by
nearby devices.
• This product is subject to the Export Administration Regulations (EAR) of the
United States, and so it cannot be exported to or brought into countries that fall
under U.S. Embargoes and Other Special Controls.
Frequency
This product uses the 2.4GHz frequency band, which can be used by other
wireless devices.
Note the following information to prevent radio wave interference with other
wireless devices.
This product has a built-in wireless low-power data communication system.
In addition to microwave ovens and other industrial, scientific, and medical
equipment, the frequency band used by this product is also used for operation
of other similar wireless stations, factory production lines and other in-plant
wireless stations for mobile unit identification that require licensing, specific
low-power wireless stations that do not require licensing, and wireless stations
(“other wireless stations”).
• Before using this product, make sure that there is no other radio station in
operation nearby.
• Should radio interference occur between this product and some other radio
station, immediately change the location where you are using this product or
stop using the other wireless station.
• If you have any other radio interference or other problem, contact CASIO
using the contact information under “Inquiries regarding functions and
operations, and where to purchase” in this User’s Guide.
Wireless Eavesdropping
Information being wirelessly sent and received is subject to being intercepted.
Unauthorized Access
CASIO COMPUTER CO., LTD. shall be held in no way liable for any loss or
damage caused by unauthorized access or use of this product’s access point
gained through loss or theft of the product.
Use as a Wireless Device
Use the wireless function of this product only as described in this User’s Guide.
CASIO COMPUTER CO., LTD. shall not be held in any way liable for any use
outside of this scope.
Magnetic Fields, Static Electricity, and Radio Interference
Do not use this product near a microwave oven or any other location where
magnetic fields, static electricity, or radio interference are generated. Certain
environments may make radio waves unreceivable. Using the product in
the vicinity of a device that also uses the 2.4 GHz band may slow down the
processing speed of this product and the other device.
[USB] cover

19
. Use in Another Country
Use of this product in areas where it is not in compliance or has not been
approved may be punishable under local laws. For details, visit the website below.
https://world.casio.com/r-law/ms/
Note that some countries and regions may regulate the use of GPS and the
collection of location logs. This product has a built-in GPS function. If you plan
to use it in another country (a country or region other than the one where you
purchased this product), you should ask the embassy of your destination or your
travel agency if you are allowed to bring a product with a GPS function into the
destination, or if there are prohibitions, restrictions or other regulations regarding
the collection of location logs.
. Other Precautions
• This product becomes warm during use. This is normal and does not indicate
malfunction.
. Registered Trademarks and Trademarks
The following terms used in the text of this manual are registered trademarks
or trademarks of their respective companies. Trademark (™) and registered
trademark (®) symbols are not used in this manual’s text.
• iPhone is a trademark of Apple Inc.
• Android and Google Play are trademarks or registered trademarks of
Google LLC.
• App Store is a service mark of Apple Inc.
• IOS is a trademark or registered trademark of Cisco Systems, Inc.
The iOS trademark is used under license of Cisco Systems, Inc.
• The Bluetooth®word mark and logos are registered trademarks owned by
Bluetooth SIG, Inc. and any use of such marks by CASIO COMPUTER CO.,
LTD. is under license. Other trademarks and trade names are those of their
respective owners.
• Other company names and product names are registered trademarks or
trademarks of their respective companies.
The software produced by CASIO on this product may not be copied, distributed,
or transferred over a network for commercial purposes without permission.
. IGRF (International Geomagnetic Reference Field) Model
This product uses the IGRF (International Geomagnetic Reference Field) model
and related software, the Geomag 7.0 software, (collectively, “IGRF”) released by
the International Association of Geomagnetism and Aeronomy (IAGA). The IGRF
is in the public domain and not licensed or under copyright. However, any and
all copyright or other intellectual property rights with respect to all other software
used and contained in this product shall remain the sole property of Casio or
Casio’s licensor.
. Open Source Software
This product includes open-source software according to the license terms
described below.
nRF5 SDK
Copyright (c) 2010 - 2019, Nordic Semiconductor ASA
All rights reserved.
Redistribution and use in source and binary forms, with or without modification, are permitted
provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice, this list of conditions and
the following disclaimer.
2. Redistributions in binary form, except as embedded into a Nordic Semiconductor ASA
integrated circuit in a product or a software update for such product, must reproduce the above
copyright notice, this list of conditions and the following disclaimer in the documentation and/or
other materials provided with the distribution.
3. Neither the name of Nordic Semiconductor ASA nor the names of its contributors may be used
to endorse or promote products derived from this software without specific prior written
permission.
4. This software, with or without modification, must only be used with a Nordic Semiconductor
ASA integrated circuit.
5. Any software provided in binary form under this license must not be reverse engineered,
decompiled, modified and/or disassembled.
THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY
EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A
PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL NORDIC
SEMICONDUCTOR ASA OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

20
Power Supply
Charging
. If the [ ] lamp flashes red while charging
This indicates that charging is not possible due to the reasons below. Follow the
instructions provided and try charging again.
Ambient temperature or battery temperature is too high or low.
Unplug the USB cable, leave it at room temperature for a while, and then try
charging again when ambient temperature is in the range of 10°C to 35°C.
Charging Timer
Depending on the model of computer you are using for charging, the connection
environment, and non-charging of the battery for a very long period, charging may
take a long time. If charging continues for longer than about five hours, a timer will
cause charging to stop even if the battery is not fully charged.
In addition, if a battery has not been used for a very long time, charging may stop
after about 60 minutes.
1) Battery is not charged after a long time.
Unplug the USB cable and plug it back in to resume charging.
2) When charging with a computer, if sufficient power is not supplied because of
the connection environment.
Charging of this product is possible only from a USB 2.0 port. Plug directly into
a USB port that can supply a current of about 500mA.
If you still get an error after taking the above steps or if charging does not
end after more than five hours, it probably means that the battery is defective.
Please contact a local authorized CASIO Service Center or your original
retailer.
Battery Use Precautions
• Due to battery characteristics, use in a cold location will shorten the battery
operating time, even if the battery is fully charged.
• Charge the battery in an environment with an ambient temperature of 10°C to
35°C. If the ambient temperature is out of this range, charging may take longer
or full charging may not be possible.
• If battery operating time is significantly shortened or even ends immediately
after charging, it probably means that the battery has reached the end of its
service life and needs to be replaced with a new one. Always request battery
replacement from a local authorized CASIO Service Center or your original
retailer. You cannot replace the battery yourself.
• If you do not use the product for a long time, fully charge the battery about
once every three months to prevent over-discharging.