Letsfit IW1 User manual

10000
10
FRI
IW1
Smart Watch
User Manual
Thank you for purchasing our products. This manual addresses the
safety guidelines, warranty, and operating instructions. Please
review this manual thoroughly before operating your device.
All pictures in this manual are for illustration purpose only. Actual product
may vary due to product firmware upgrade and app upgrade.

Table of Contents
English Version .................................................... 1
Getting Started................................................................1
What’s in the Box ...............................................................1
What’s in this Document ....................................................1
Setting up Your Watch..................................................1
Charging Your Watch .........................................................1
Disassembling / Assembling Your Watch...........................2
Wearing Your Watch......................................................4
Using Your Watch...........................................................5
App Installation ..................................................................5
Account Registration and Login ........................................6
Pairing the Watch with Your Phone....................................7
App Interfaces....................................................................9
Getting to Know Your Watch.....................................11
Basic Operation ................................................................11
Watch Interfaces ...............................................................11
Function Introduction..................................................13
1. Tracking Sports .............................................................14
2. Tracking Daily Activity Data...........................................15
3. Monitoring Heart Rate...................................................15
4. Measuring Blood Oxygen Level ....................................16
5. Breathing Guide ............................................................17
6. Setting Alarms ...............................................................17
7. Controlling Phone Music ...............................................17
8. More Functions .............................................................18
8.1 Call Notification.......................................................18
8.2 Message Notification...............................................18
8.3 Sedentary Reminder ..............................................18
8.4 Stopwatch ...............................................................18
8.5 Timer.......................................................................19
Basic Specifications.....................................................
19
FAQs .................................................................................. 20
Warranty ........................................................................... 22
Important Safety Instructions ...................................22

- 1 -
What’s in the Box
Getting Started
Setting up Your Watch
What’s in this Document
This manual gets you started quickly with setting up your watch.
Setup ensures that your watch can synchronize its data with the
Letsfit app, where you can get detailed information on your
stats, view historical trends, log sleep, and more. As soon as
setup is complete, you’re ready to start moving. The remainder
of the manual walks you through every function on your IW1.
Charging Your Watch
Please fully charge your watch before initial use.
1. Insert the USB plug of the charging cable into the USB port
on your computer or a UL-certified USB wall charger.
2. Hold the other end of the charging cable near the port on
the back of the watch until it attaches magnetically.
3. Make sure the pins on the charging cable lock securely with
the port. The connection is secure when the watch vibrates
and the battery icon with percent charged appears on the
screen.
Charging cable User manualSmart watch
(IW1 with bands)
Quick start
guide
Quick Start
Guide
IW1
Smart Watch
User Manual
Thankyou for purchasing our products. This manual addresses the
safetyguidelines, warranty, and operating instructions. Please
reviewthis manual thoroughly before operating your device.
Allpictures in this manual are for illustration purpose only. Actual product
mayvary due to product firmware upgrade and app upgrade.
1

- 2 -
When the watch shows that the battery is
low, connect the watch to a USB port with
5V-500mA.
While the watch charges, there is a battery
progress circle on the screen and you can
check the battery level at any time.
4. Remove the watch from the power supply once fully charged.
● USB charger requirement: DC USB port (5V-500mA)
● Charging time: Approximately 2 hours
Disassembling / Assembling Your Watch
Disassembly
1. To remove the wristbands, turn over the watch and find the
quick-release lever.
2. While pressing the quick-release lever inward, gently pull the
wristband away from the watch to release it.

- 3 -
3. Repeat on the other side.
Assembly
1. To reattach the wristbands, slide the pin (the side opposite
the quick-release lever) into the notch on the watch. Attach
the wristband with the clasp to the top of the watch.
2. While pressing the quick-release lever inward, slide the
other end of the wristband into place.
3. When both ends of the pin are inserted, release the
quick-release lever.

All-day Wear and Exercise
Wearing Your Watch
- 4 -
For all-day wear when you’re not exercising, wear the device
on your wrist horizontally, a finger’s width below your wrist
bone and lying flat, the same way you would put on a watch.
For optimized heart rate tracking, keep these tips in mind:
1. Experiment with wearing the watch higher on your wrist during
exercise. Because the blood flow in your arm increases the
farther up you go, moving the watch up a couple of inches can
improve the heart rate signal. Also, many exercises such as
bike riding or weight lifting require you to bend your wrist
frequently, which is more likely to interfere with the heart rate
signal if the watch is lower on your wrist.
2. Do not wear your watch too tight. A tight band restricts blood
flow, potentially affecting the heart rate signal. This being
said, the watch should also be slightly tighter (snug but not
constricting) during exercise than during all-day wear.

- 5 -
Using Your Watch
App Installation
Use the watch with our customized Letsfit app. You can
download Letsfit from App Store / Google Play or scan the QR
codes below to download.
AndroidiOS
Letsfit
Note:
The Letsfit app is only compatible with smartphones, not
tablets or PCs.
● iOS 11.0 & higher
● Android 6.0 & higher
● Bluetooth 4.0 & higher
Smart Phone System Requirements

- 6 -
Account Registration and Login
Please register an account with a valid email address. After
registration, check your email box to complete email
verification, and then tap "Verified" to log in.

- 7 -
Please pair the watch with your phone in the Letsfit app,
NOT in the Bluetooth settings of your phone.
1. Enable the Bluetooth of your smartphone.
2. Open the Letsfit app on your smartphone and go to the
"Settings" page, tap "+ Pair new device".
3. Tap "IW1", and your smartphone starts scanning.
4. Select the watch language on the watch and enter the QR
code interface as instructed.
5. Use the Letsfit app to scan the QR code displayed on your
watch to connect the watch to your smartphone.
Pair the watch with your
smartphone in the Letsfit app
Do NOT pair the watch
with your smartphone
in your phone’s
Bluetooth settings
iOS Android
Pairing the Watch with Your Phone

- 8 -
1 2 3
+ Pair new device
IW1
Notes:
● You can also search this device in the app to pair (Go to
"Settings" page → "+ Pair new device" → "IW1" → tap "Search
Devices").
● Once the watch is connected to your app, the watch will
automatically search and reconnect itself if the connection is
lost or when Bluetooth is restarted after manual disconnection.
● If you unpair the watch with the app, the information on the
watch will be reset and the watch will be restarted. Please do
not unpair the watch with the app unless there is an issue that
will require a reset.
● The watch can only pair with one smartphone at a time. When
pairing, please ensure the watch and your smartphone is
within 0.5 meters distance.

- 9 -
App Interfaces
Activity
Swipe down
to sync data.
Swipe right and
choose a date to
view data.
Daily Target Value
Daily Workout
Minutes
Daily Steps
Daily Active Hours

- 10 -
Training
When you start a sport mode on
your watch, detailed data and
graphs will be displayed here
after the exercise is over (swipe
down to sync data first).
Tap "IW1", you can
customize call / message /
alarm alert or set other
parameters.
Settings
****

-11 -
Getting to Know Your Watch
Basic Operation
Watch Interfaces
This is a touch screen; swipe the screen to go to different
interfaces, and tap to enter the function.
The home screen is a clock. On the clock:
● Swipe up to see the quick settings bar (do not disturb, wrist
sense, night mode, settings).
● Swipe down to see notifications.
● Swipe left to the function list, including workout, today, heart
rate, blood oxygen, breath, timer, stopwatch, alarm, music
control, and settings.
● Swipe right to view today’s daily activity data (You can
customize this interface in the Letsfit app. Go to the "Setting"
page → "IW1" → "Control Center".)
10000
10
● Turn on / off the watch:
Press and hold the function button for 3
seconds.
● Wake a dimmed screen:
Press the function button or turn your
wrist towards you.
● Return to the previous interface:
Press the function button or swipe the
screen to the right.

- 12 -
10000
10
FRI
Today
5000
/10000
After the watch is paired with your phone, the home screen will
display the time and date.
You can customize the home screen by following the steps below:
Method 1:
1) Go to "Settings" → "General" → "Watch Face" on the watch.
2) Swipe the screen to choose a watch face and tap to confirm.
Method 2:
1) Open the Letsfit app, go to the "Settings" page → "IW1" →
"Watch Faces". Select a watch face and then choose the
information you want to display on the home screen.
2) Tap "Confirm" to finish setting.
10000
10
FRI
10:10 am
Twitter
Tom
The weather this
week has been
mostly cloudy, Take
an umbrella.

- 13 -
Function Introduction
Tracks your exercise
data in up to 14 sports
modes. Choose the
mode that you want to
start on the watch.
Tracks your
real-time heart rate
automatically and
continuously.
Measures your
blood oxygen level.
Guides your
breathing for a
relaxation.
Customize your
timer.
Check your daily
activities and
sleep data.
Use the stopwatch to
make your exercise
more standardized.
Set different types
of alarms in the
app to make the
watch vibrate to
remind you.
Control the music
playing of your
smartphone.
Some basic
settings and
information of
the watch.
O
2

- 14 -
1. Tracking Sports
The watch tracks your exercise data in up to 14 sports modes.
Start a sport
Tap "Workout" → Swipe the screen to select a sports mode
you want to start.
During sports
Swipe the screen up or down to flip through
exercise data. Swipe the screen to the left
so you can control the music playing on
your phone.
End the sport
Press the function button and tap " " to end the sport.
Exercise data is displayed after the exercise has ended. Swipe
up the screen to flip through exercise data:
GPS connecting (Only for Outdoor Run / Outdoor Cycle / Outdoor
Walk modes)
When you start an outdoor sport, the watch
begins searching GPS signal. Please let the
Letsfit app run in the background and allow
the location services on your phone, then
move to an open area and stand still to
better receive the signal. After the GPS is
connected, tap " " to start the exercise.
When the GPS signal is weak, you can start
Outdoor Run, Outdoor Cycle, Outdoor Walk
in non-GPS mode. Your movement route
will not be displayed in your training record
after the exercise is ended.
GPS connected
Outdoor Run
Failed to connect to
GPS, Start in Non-
GPS mode?
165
00:30:20
10'06"
/mi
08:30
mi
3.1
08:30
Paused
Duration
00:30:20
2020/08/30 08:00
Outdoor Run
Distance
3.1
mi

- 15 -
Notes:
● After ending an exercise, you can
view detailed data and graphs in the
app (Go to the "Training" page, swipe
down the page to synchronize data,
and tap the exercise you just ended).
● After you finish the outdoor cycling,
outdoor running or outdoor walking
exercise in GPS mode, your
movement track will be displayed in
the app (Go to the "Training" page of
the app, and then tap on the exercise
you just ended to view).
● Data of exercises less than 2
minutes will not be saved.
● When the battery level is less than
10%, the watch enters low battery mode, in which you cannot
start a sports mode. Please charge the watch to operate it again.
2. Tracking Daily Activity Data
The watch tracks your all-day activity data, including steps, distance,
calories burned, sleep, and workout data.
Today
5000
/10000
5.0
mi
350
kcal
Calories
08
hr
28
min
Sleep
3. Monitoring Heart Rate
After entering the heart rate interface, the watch tracks your
real-time heart rate automatically and continuously. You can view
your detailed heart rate data on the watch screen or in the app.
78
bpm
6h
12h
18h
159
100
42
149
52
Heart Rate

- 16 -
Note:
To monitor heart rate more accurately, wear the watch on the
upper position of your wrist and a bit tighter than usual when
you exercise. In addition, complete your profile in the app.
4. Measuring Blood Oxygen Level
Before measuring, wear the watch a finger-width below the wrist
bone and a bit tighter than usual.
1) Tap "Blood Oxygen" to enter the blood oxygen level detection
mode.
2) When measuring, keep your arm flush with your chest and the
watch screen facing up. Keep your arm still to ensure the
accuracy of the data.
Measuring
…
Sleep Detection Mode: If you want the watch to track your
blood oxygen level during sleep, please open the Letsfit app,
go to the "Settings" page → "IW1", and turn on the blood
oxygen measurement switch. The blood oxygen data will then
be displayed in the app (Go to the "Activity" page → "Sleep
Schedule").

- 17 -
5. Breathing Guide
Swipe the screen of the watch to enter breathing mode. Select
the duration of the breathing training and follow the instructions
to breathe. If you want to end the breathing training, press the
function button, or swipe the screen to the right.
7. Controlling Phone Music
After the watch is connected to the Letsfit
app on your phone, tap "Music Control"
on the watch to enter the function and
control the music playing on your phone.
6. Setting Alarms
1) Go to the "Settings" page in the Letsfit app and tap "IW1".
2) Tap "Alarm" to enter the alarm setting interface.
3) Tap "Add" to add an alarm.
4) Set the alarm time, name, vibration period and repeat time.
Choose to turn on/off the smart wake mode or the snooze
mode.
5) Tap "Confirm" to save your settings.
Note:
You can only control the music player that’s running on your
phone.
Breath
Stopwatch
Timer
Alarm
00:59
inhale
07:00
am
Get up
Everyday
Alarm
06:35
Alarm
am
You can enable / disable the alarm on your
watch (Tap "Alarm" on the watch and turn
on/off the alarm you set.)
Music Control

- 18 -
8. More Functions
8.1 Call Notification
When there is an incoming call, the watch vibrates
to alert you, and the screen displays the caller ID.
Tap " " on the watch screen to reject the call.
Tap " " to turn on vibration-free mode.
8.2 Message Notification
When messages (like Facebook, Twitter, and
Instagram messages) come in, the watch vibrates
to alert you, and the screen displays the message
content.
8.3 Sedentary Reminder
The watch vibrates to remind you to get up and move around
when you have been sitting too long (Go to "Activity" page →
"Active Hours" → "Sedentary Alert Settings" → enable the
movement reminders function and set the remind interval.)
1-954*******
Incoming Call
Notes:
● Only when "Notification alerts" is enabled in the app ("Settings"
page → "IW1" → "Notification alerts"), will calls be notified.
● When the "Do not disturb" function is enabled in the app
("Settings" page → "IW1" → "Do Not Disturb") or on the watch
(Quick settings bar → ), calls will not be notified on the
watch during the do-not-disturb period.
Notes:
● Only when "Notification alerts" is enabled in the app ("Settings"
page → "IW1" → "Notification alerts"), will messages be notified.
● When the "Do not disturb" function is enabled in the app
("Settings" page → "IW1" → "Do Not Disturb") or on the watch
(Quick settings bar → ), messages will not be notified on the
watch during the do-not-disturb period.
8.4 Stopwatch
1) Tap "Stopwatch" to enter the function.
2) Tap " " to start.
10:10 am
Twitter
Tom
The weather this
week has been
mostly cloudy, Take
an umbrella.