Amazfit JHS20W2 User manual

Anhui Huami Healthcare Co.,Ltd.
User Manual
Version 0.2
Amazfit Health Watch
JHS20W2
Anhui Huami Healthcare Co., Ltd.

Anhui Huami Healthcare Co.,Ltd.
Please read this instruction manual thoroughly before using the unit. Please keep
for future reference.
Caution for Prescription use:
Federal law restricts this device to sale by or on the order of a physician.
1. Indications for Use
Midong Health Watch (ECG Recorder) is designed to create, record, store, transmit, and
display single-channel electrocardiogram (ECG) rhythms similar to Lead I ECG. The
Midong Health Watch can also display ECG rhythms and detect the presence of AF (when
prescribed by a doctor or used). Midong Health Watch is for healthcare professionals,
adult patients with known or suspected AF, and health-conscious adults.
Midong Health Watch is not intended for use by people under 22 years old.
The device communicates with iOS orAndroid App after binding. If abnormal binding and
unbinding occur, please contact the manufacturer in time to confirm.
2. Product Description
Midong Health Watch is a Bluetooth-based (transmission by Bluetooth LE) ECG
(electrocardiogram) event recorder that records, stores, and transfers single-channel
electrocardiogram rhythms.
The device is designed to capture a user’s ECG data and transmit the data via Bluetooth
to an iOS orAndroid mobile phone, which transmits the ECG data over the network to the
Cloud servers.
The device consists of wristband, Midong Health Watch, the embedded software (installed
on the Midong Health Watch), mobile phone application (Amazfit Health app installed on
the mobile phone), and charging cable. Amazfit Health app can store thousands of
recordings on a mobile phone, and these recordings are also accessible to authorized
users on Cloud servers.All ECG data is synced with the user’s account on the Amazfit
Health app.After a user has created an account on the Amazfit Health app, users can
view real-time ECG waveforms during recording or review historical data through their
Amazfit Health app user accounts. The data can be stored locally on the mobile phone
and transmitted to the Cloud servers for analysis and assessment by qualified
professionals.
A typical configuration is to record 60 seconds of ECG per event.
The device is placed on the wrist for a single-channel ECG rhythm recording.
The heart rate is for general wellness only, not for diagnostic use. Do not make any
reference to diseases or conditions.
3. General Safety Precautions
-The device should not be used in the shower or bath, or any activities like swimming

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that may submerge the device in water.
-Do not use the device in locations subject to high or low temperatures or humidity. It
should be used within the temperature and humidity range according to the product label.
-Do not take recordings in a location where the unit is exposed to strong
electromagnetic forces, such as microwave ovens or X-rays.
-Do not use the device while being charged.
-Connect to a charger with 5V output voltage and avoid charging the device under the
condition that the temperature is too high or too low.
-Do not overcharge or over-discharge the device. Charge the device in time when the
battery power is lower than 25% and disconnect the charging cable in time after
completion of charging.
-Disperse any static electricity from your body before using the device.
-Take recordings as calm as possible.
-Do not expose the device to strong shocks or vibrations, if the shell is broken, please
stop using it..
-Do not disassemble, repair, or modify the device.
-Do not take a recording if the electrode sensors are dirty. Clean them with
alcohol-based sanitizer before use.
-If the portion of the body where the electrode sensor is applied has too much body fat,
body hair, or very dry skin, a successful recording may not be possible.
-Do not share the device with another person to avoid cross-infection
-If the device is not to be used for a long time, please fully charge the battery and
recharge it every 2 months to prevent the battery from over-discharging.
-Keep the Bluetooth connection between the device and the mobile phone when
recording.
-Make sure the mobile phone has sufficient memory storage.
-WhenAPP is registered, the password should be at least 8 characters in length, and
contain two or more characters of uppercase characters, lowercase characters, base 10
digits and non-alphabetic characters.
-Avoid using commonly used passwords to prevent passwords from being guessed
and maliciously logged in to reveal your personal privacy data.
-Upgrade firmware and APP in a secure network environment as much as possible.
-The MAC address is the unique identification of the device. Please do not disclose
the MAC address of the device to others.
4. Warnings
-This device is not designed or intended for a complete diagnosis of cardiac conditions.
This device should never be used as a basis for starting or modifying treatment.
-This device records heart rate and heart rhythm only.
-This device does not detect or measure heart rate, heart rhythm, and heart waveform
changes.
-Do not attempt self-diagnosis or self-treatment based on the recording results and
analysis. Self-diagnosis or self-treatment may lead to deterioration of your health.
-Users should always consult their physician if they notice changes in their health.

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-Do not use in the presence of flammable anesthetics, drugs, or pressurized oxygen
(such as in a hyperbaric chamber, ultraviolet sterilizer, or oxygen tent).
-Do not use this device during an MRI or CT scan.
-Keep out of reach of infants, small children, or anyone incapable of using the device
properly.
-The device has not been tested for use on infants weighing less than 10kg. Huami
does not recommend using on humans less than 10kg.
-Do not use this device with a defibrillator.
-Huami does not recommend using on individuals with a cardiac pacemaker, ICDs, or
other implanted electronic devices.
-The disposal of the device and accessories follows customary electronic waste
recycling procedures.
-In case of a software crash or termination, please restart the software and re-record.
-The changes in the mobile phone memory (such as plugging, unplugging, or
replacing the SD card) may cause operation failure and historical data loss.
-This produce is not allowed to be used together electrosurgical instruments.
-To keep the device away from fire, do not heat it, otherwise the internal battery may
explode.
5. Warning: MR-unsafe!
-This device is NOT MRI Compatible
-Do not expose the device to a magnetic resonance (MR) environment.
-The device may present a risk of projectile injury due to the presence of
ferromagnetic materials that can be attracted by the MR magnet core.
-Thermal injury and burns may occur due to the metal components of the device that
can heat during
-MR scanning.
-The device may generate artifacts in the MR image.
-The device may not function properly due to the strong magnetic and radiofrequency
fields generated by the MR scanner.
6. Storage and Handling
Do not store the unit in:
-Locations exposed to direct sunlight.
-Locations subject to high temperatures and high humidity.
-Wet or damp locations where water may get on the unit.
-Dusty locations.
-Near fires or open flames.
-Locations exposed to intense vibration.
-Locations exposed to strong electromagnetic fields.
7. Maintenance
Cleaning and Disinfection method
- Clean the device using an alcohol-based sanitizer before each use.

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- Wipe the surface of the device with a clean, soft cloth with clean water to remove the
resident sanitizer, then air dry.
8. Set up the Midong Health Watch
8.1 Select a mobile phone to use
The Amazfit Health app of the Midong Health Watch is compatible with the following
systems supports Bluetooth 4.2:
-Android Operating System versions 4.4 or later
-iOS 10.0 or later
8.2 Unpack the Midong Health Watch
Remove the Midong Health Watch from the box.
Midong Health Watch
腕带
8.3 Charging
Charge the ECG Recorder before the first use.As shown in the figure, attach the ECG
recorder to the charging base at the end of the charging cable. Then connect the USB
plug to the phone charger or a computer's USB port to charge. When charging starts,
animation of the charging progress is displayed on the ECG Recorder screen.

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8.4 Download Amazfit Health app
Use your mobile device to scan the following QR Code, depending on the system.
Download and install the Amazfit Health app.
8.5 Set up an account
You will use your account to access, print, and save your ECG recordings stored on the
Amazfit Health app and the Cloud servers. Follow the instructions presented when
opening theAmazfit Health app for the first time. You can go back later and change your
information if necessary.
8.6 Connect the Midong Health Watch to mobile phone
Turn on the mobile phone Bluetooth, and connect the Midong Health Watch following the
instructions presented when opening the Amazfit Health app. When the Midong Health
Watch vibrates, and the prompt animation appears on the screen, touch the Midong
Health Watch button to complete the connection of the ECG Record and the Amazfit
Health app.
The Midong Health Watch must be less than 10 m from the mobile phone to ensure
communication between devices.
8.7 Environment in which the product is intended to be used
8.7.1 The device is protected against security threats that are connected to an insecure

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network environment (e.g., public WIFI) when it is logged in, upgraded, and unbound.
8.7.2 In the case of device binding, other mobile phones can not search for the device via
Bluetooth. They need to be unbound before they can be found and bound by other mobile
phones to ensure the security of device binding.
8.7.3 In the case of an unbound device, although other mobile phones can search for the
device via Bluetooth, they must be bound by touching the device.
9. Take ECG recording using the Midong Health Watch
9.1 Before taking each recording:
-Disconnect headphones, charging cable, or any other connected devices.
-Clean the two electrode sensors with an alcohol-based sanitizer.
-Make sure the connection of the Midong Health Watch and the Amazfit Health app.
9.2 Measurement
9.2.1 Wear the ECG Recorder wristband on the left wrist, avoiding the carpal bone. (If
wearing on the right wrist, follow the instructions by swapping left and right)
9.2.2Adjust the wristband to the appropriate tightness so that the electrode sensors
contact the skin.
9.2.3 Rest your right forefinger on the front electrode. Press your right forefinger with
enough force to ensure that the rear electrode sensors are in contact with the skin of your
left wrist for the entire duration of the recording. Remain still while recording, and the
Midong Health Watch, forearm, and hands should not move while recording.
The recording takes 60 seconds offline or 240 seconds online, as directed by the user.
-30 seconds offline recording: the ECG data is temporally stored on ECG Record
memory before transmitted to the Amazfit Health app and Cloud servers.
-60 seconds online recording: The ECG data is transmitted to the Amazfit Health app
and Cloud servers in real-time.
10. Once the recording is finished
Immediately after the recording is complete, the software automatically saves the ECG
data.
The ECG data displays for review. The review screen allows you to scroll through the
ECG by swiping your finger across the screen, and you can pinch and zoom to scale the
ECG. There are also options to edit user’s information, review previous or next recordings.

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You can also order an ECG analysis report to have your ECG recording reviewed by a
professional.
When you have finished reviewing the ECG recording, either press the 'Home' button to
exit the app or press the 'Back' key to return to the 'Record' screen, where you can then
record another ECG.
11. View previously recorded ECG recordings on your mobile phone
Historical records are displayed on the page of “History”. To view the recordings, open the
menu bar by pressing the button on the upper left corner, and then choose “History”. On
the History page, historical recordings of the current month display in time sequence. To
view the recordings of another year/month, click on the date above the recordings so that
a time widget pops up. Scroll up or down to choose the desired date.
Measurement mode, date, start time, and duration are shown in every single record card.
Click on a card; it expands into several time segments. Click on a time segment to view
the electrocardiograph within the period.
12. Editing user profile
To view or edit personal profile, open the menu bar by pressing the button on the upper
left corner, and then click on the portrait area. In the personal profile page, nickname, sex,
date of birth, height, and weight can be modified.
13. ECG Analysis
Subsequent recordings:
-After an ECG recording is complete, the ECG is analyzed to determine if it is at least
60 seconds long, if it is no Atrial Fibrillation, Unclassified, if Atrial Fibrillation is present,
or if it is too noisy to interpret.
-To view the ECG, please visit the history page.
-The presence of Atrial Fibrillation (AF) in your ECG results may present only potential
findings. If you are experiencing any symptoms or have concerns, contact your
physician.
-Unreadable ECG results determine that you didn’t have proper ECG recording for
analysis. You might try to re-record your ECG.
-ECG reports viewed at any magnification other than 100% may appear distorted and
could lead to misdiagnosis.
-All ECGs are synced to theAmazfit Health app. You may use the phone app to send
your ECGs for physician analysis.
14. Troubleshooting
Problem
Solution
The device is not
working.
Option 1: Check the battery has power.
Option 2: Ensure that the Amazfit Health app has access to the
device.
Option 3: Close the device to the mobile phone as much as
possible

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Option 4: Try to turn off and on the Bluetooth of the mobile
phone or restart the mobile phone.
I have a lot of artifact,
noise, or interference
in my recording or no
ECG recording.
Option 1: Ensure that your ECG Record, arms, and hands
remain still during recordings.
Option 2: Clean the electrode sensors on the device with an
alcohol-based sanitizer.
Option 3: If your skin is very dry, use a water-based lotion before
recording.
Option 4: When recording, relax your arms and hands to reduce
muscle noise.
Failure in data
uploading The data uploading is related to the network environment; you can try to change the network environment (switch to WiFi/4G).
15. Specifications
Performance characteristics
ECG Channels: Single Channel
Input Dynamic Range: 10 mV Peak-to-Peak
Memory length: Practically unlimited
Recording format: Continuous
Circuitry
Frequency Resp.: 0.67 Hz to 40 Hz
CMRR: ≥ 60 dB
Input impedance: > 10 MΩ
Differential range: ±5 mV
A/D Sampling Rate: 250 samples/second
Resolution: 22 bit
DC offset correction: ± 300 mV
Input
Frequency: 2400 - 2483.5 MHz
Modulation: GFSK
Frequency: 2400~2483.5MHz
MAX Transmitted power: dBm
Power requirement
AC Input: 100V - 250V, 50Hz/60Hz to 5VDC Adapter with 5V USB Adapter Cable
Battery Type: DC 3.85V, 190 mAh, Lithium battery
Charging Time: 2.5 hours from flat
Operating Time: 24 hours on a full charge
Physical characteristics
Midong Health Watch: 42 ×35 ×12.5 mm; 25 grams
Wristband length: 118~195 mm
0

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Environment specifications
Operational temperature: +10℃~+40℃
Operational humidity: 30%~75% (non-condensing)
Storage temperature: -10℃~+45℃
Storage humidity: 10%~95% (non-condensing)
16. ELECTROMAGNETIC & OTHER INTERFERENCES
The Amazfit Health Watch has been tested and deemed in conformance with the relevant
requirements in IEC60601-1-2:2014 Class BF for Electromagnetic Compatibility (EMC).
The Midong Health Watch has been tested with relevant requirement standard
IEC60601-1-11:2015.
17. Electrical safety
17.1Electromagnetic Emissions
The system is intended for use in the electromagnetic environment specified in Table 1.
The customer or the user of the system should ensure that it is used in such an
environment.
WARNING
-The use of this equipment adjacent to or stacked with other equipment should be
avoided because it could result in improper operation. If such use is necessary, this
equipment and the other equipment should be observed to verify that they are operating
normally.
-In addition to the accessories provided by the equipment manufacturer, the use of
other accessories may cause increased electromagnetic radiation or reduce
electromagnetic immunity, resulting in equipment failure.
-Stay away from active high-frequency surgical equipment in hospitals and RF
shielded rooms for systems used for magnetic resonance imaging, where electromagnetic
interference is high.
Table 1 Electromagnetic Emissions: Environment Guidance
Emissions Test Compliance Electromagnetic Environment
Guidance
RF emissions
CISPR 11 Group 1 The system uses RF energy only for its internal function. Therefore, its RF
emissions are very low and are not
likely to cause any interference in
nearby electronic equipment.
RF emissions
CISPR 11 Class B
17.2Electromagnetic Immunity
The system is intended for use in the electromagnetic environment specified in Table 2.

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The customer or the user of the system should ensure that it is used in such an
environment.
NOTE
These guidelines may not apply in all situations. Electromagnetic propagation is affected
by absorption and reflection from structures, objects, and people.
Table 2 Electromagnetic Immunity
Immunity
Test Input/ Output
Port
IEC
60601-1-2
Test
Level
Compliance
Level Electromagnetic Environment
Guidance
Electrostatic
discharge
(ESD)
IEC 61000-4-2
Enclosure
port ±8 kV contact
±15 kV air
±8 kV contact
±15 kV air The table should be wood. If the table is
covered with
synthetic material,
the relative humidity
should be at least
30%.
Power
Frequency (50/
60 Hz)
magnetic field
IEC 61000-4-8
Enclosure
port 30 A/m 30 A/m Power frequency magnetic fields
should be at levels
characteristic of a
typical location in a
typical commercial or
hospital
environment.
Radiated RF
IEC 61000-4-3 Enclosure Port 10 V/m 80 MHz to
2.7 GHz
10 V/m
80 MHz to
2.7 GHz
For recommended
separation
distances,
see Table 6
Proximity fields
from RF
wireless
communications
equipment
IEC 61000-4-3
Enclosure
port 27 V/m 380 MHz to
390
MHz
28 V/m
430 MHz to
470
MHz,
800 MHz to
960
MHz,
1700 MHz
to
Same as
IEC 60601-1-2
test level

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1990 MHz,
2400 MHz
to
2570 MHz
9 V/m
704 MHz to
787
MHz,
5100 MHz
to
5800 MHz
Cables connected to the system may affect its immunity to the electromagnetic
phenomena listed in Table 5. Use only cable types and lengths listed in Table 2 to
minimize the change of performance degradation due to these types of electromagnetic
phenomena.
The transducers used with the system may affect its immunity to the electromagnetic
phenomena listed in Table 5. Use only the transducers listed in Table3 to minimize the
chance of performance degradation due to these types of electromagnetic phenomena.
Accessories used with the system may affect its immunity. Use only the transducers
listed in Table 4 to minimize the chance of performance degradation due to these types
of electromagnetic phenomena.
17.3Recommended Separation Distance
Table 3 provides guidance on the distances any radio frequency (RF) transmitting
equipment should be kept away from the system to reduce the risk of interference with the
imaging system. Table 6 lists the recommended separation distances between portable
and mobile RF wireless communications equipment and system.
Table 3 Recommended Separation Distances
Immunity of RF
wireless communications
equipment Test level(V/m)
Maximum
Power(W) Band(Hz) Distance(m)
27 1.8 380-390 0.3
28 2 430-470 0.3
9 0.2 704-787 0.3
28 2 800-960 0.3
28 2 1700-1990 0.3
28 2 2400-2570 0.3
Note: Where P is the maximum power in W.E is the immunity test level in V/m, and d is
the minimum separation distance in m.
WARNING

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Portable RF communications equipment (including peripherals such as antenna cables
and external antennas) should be used no closer than 30 cm (12 inches) to any part of the
Wearable dynamic Midong Health Watch, including cables specified by the manufacturer.
Otherwise, degradation of the performance of this equipment could result.
18. Equipment symbols
Type BF Applied Part
WEEE –Properly Dispose of Electronic Waste
Consult Instructions for Use / User Manual
Manufacturer
Temperature Limits (Operational)
Relative Humidity Limits (Operational)
Serial Number
recyclable
19. Manufacture and date
Anhui Huami Healthcare Co., Ltd.
12th Floor, Building A4, National Animation Industry Base, No.800 Wangjiang West Road,
Hefei City,Anhui Province, China
Tel: [phone]
Email: [e-mail]
Date of manufacture: See the package
Date of issuance:2020.02.19

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FCC Warning
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions:
(1) This device may not cause harmful interference, and (2) this device must accept any interference
received, including interference that may cause undesired operation.
Any Changes or modifications not expressly approved by the party responsible for compliance could void
the user's authority to operate the equipment.
Note: This equipment has been tested and found to comply with the limits for a Class B digital device,
pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against
harmful interference in a residential installation. This equipment generates uses and can radiate radio
frequency energy and, if not installed and used in accordance with the instructions, may cause harmful
interference to radio communications. However, there is no guarantee that interference will not occur in a
particular installation. If this equipment does cause harmful interference to radio or television reception,
which can be determined by turning the equipment off and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
-Reorient or relocate the receiving antenna.
-Increase the separation between the equipment and receiver.
-Connect the equipment into an outlet on a circuit different from that to which the receiver is
connected.
-Consult the dealer or an experienced radio/TV technician for help.
The device has been evaluated to meet general RF exposure requirement. The device can be used in portable
exposure condition without restriction.