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D21 Smart Bluetooth Watch for Android iOS
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D21 Smart Bluetooth Watch for Android iOS

- Black 173192704

Sleep Monitoring Heart Rate Monitor Sedentary Alert Calorie Burning Distance Measurement for Sports
24.63
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Main Features:
nRF51822 chip and Bluetooth 4.0 technology: Adopt nRF51822 chip and Bluetooth 4.0 technology that it can quickly and efficiently meet the needs of your life.
Heart rate monitor: Give you the accurate real-time feedback, let you keep fit easily.
Sleep monitor / Sedentary reminder / Pedometer: Take care of your health, monitor your sleep, remind you to have a rest and track your sports.
Distance measurement: Measure your daily walking distance precisely.
Calorie consumption management: Calculate the consumption of calorie, record the daily burned calorie.
Call / SMS reminder: When a call or message is coming, you can check it without taking out of your mobile phone.

Specification

Hardware

Bluetooth Version: Bluetooth 4.0
Built-in chip type: NRF51822
IP rating: Life water resistance
Waterproof: Yes

Functions

Alert type: Ring,Vibration
Bluetooth calling: Phone call reminder
Health tracker: Heart rate monitor,Pedometer,Sedentary reminder,Sleep monitor
Messaging: Message reminder
Other Function: Alarm

Screen

Screen: OLED
Screen resolution: 64 x 48
Screen size: 0.66 inch
Operating mode: Touch Screen

Battery

Battery Capacity: 80mAh
Charging Time: About 60mins
Standby time: 3-4 days
Type of battery: Polymer battery

General

People: Female table,Male table

Dial and Band

Band material: Silicone
Case material: Stainless Steel
Shape of the dial: Rectangle

Features

Available Color: Black,Pink,Purple,White
Compatability: Android 4.3, iOS 7.0 and above system
Compatible OS: Android,IOS
Language: English,Simplified Chinese,Traditional Chinese

Weight and Size

Dial size: 4.53 x 2.40 x 1.23 cm / 1.78 x 0.94 x 0.48 inches
Package size (L x W x H): 15.40 x 8.80 x 3.10 cm / 6.06 x 3.46 x 1.22 inches
Package weight: 0.164 kg
Product size (L x W x H): 12.50 x 2.40 x 1.23 cm / 4.92 x 0.94 x 0.48 inches
Product weight: 0.030 kg
Band size: 12.50 x 0.95 cm / 4.92 x 0.37 inches

Package Contents

Package Contents: 1 x Smart Watch, 1 x Chinese and English Manual, 1 x Charging Clip

D21 Smart Bracelet Watch Bluetooth 4.0 SMS Reminder Sleep Tracker Calorie Burning Incoming Call Show for Sports- Black

D21 Smart Bracelet Watch Bluetooth 4.0 SMS Reminder Sleep Tracker Calorie Burning Incoming Call Show for Sports- Black

D21 Smart Bracelet Watch Bluetooth 4.0 SMS Reminder Sleep Tracker Calorie Burning Incoming Call Show for Sports- Black

D21 Smart Bracelet Watch Bluetooth 4.0 SMS Reminder Sleep Tracker Calorie Burning Incoming Call Show for Sports- Black

D21 Smart Bracelet Watch Bluetooth 4.0 SMS Reminder Sleep Tracker Calorie Burning Incoming Call Show for Sports- Black

D21 Smart Bracelet Watch Bluetooth 4.0 SMS Reminder Sleep Tracker Calorie Burning Incoming Call Show for Sports- Black

D21 Smart Bracelet Watch Bluetooth 4.0 SMS Reminder Sleep Tracker Calorie Burning Incoming Call Show for Sports- Black

D21 Smart Bracelet Watch Bluetooth 4.0 SMS Reminder Sleep Tracker Calorie Burning Incoming Call Show for Sports- Black

D21 Smart Bracelet Watch Bluetooth 4.0 SMS Reminder Sleep Tracker Calorie Burning Incoming Call Show for Sports- Black

D21 Smart Bracelet Watch Bluetooth 4.0 SMS Reminder Sleep Tracker Calorie Burning Incoming Call Show for Sports- Black

D21 Smart Bracelet Watch Bluetooth 4.0 SMS Reminder Sleep Tracker Calorie Burning Incoming Call Show for Sports- Black

D21 Smart Bracelet Watch Bluetooth 4.0 SMS Reminder Sleep Tracker Calorie Burning Incoming Call Show for Sports- Black

D21 Smart Bracelet Watch Bluetooth 4.0 SMS Reminder Sleep Tracker Calorie Burning Incoming Call Show for Sports- Black

D21 Smart Bracelet Watch Bluetooth 4.0 SMS Reminder Sleep Tracker Calorie Burning Incoming Call Show for Sports- Black

D21 Smart Bracelet Watch Bluetooth 4.0 SMS Reminder Sleep Tracker Calorie Burning Incoming Call Show for Sports- Black

D21 Smart Bracelet Watch Bluetooth 4.0 SMS Reminder Sleep Tracker Calorie Burning Incoming Call Show for Sports- Black

D21 Smart Bracelet Watch Bluetooth 4.0 SMS Reminder Sleep Tracker Calorie Burning Incoming Call Show for Sports- Black

D21 Smart Bracelet Watch Bluetooth 4.0 SMS Reminder Sleep Tracker Calorie Burning Incoming Call Show for Sports- Black


FAQ for Smart Watch and Wristband
1. Q: I can’t charge my watch / bracelet and it doesn’t power on, what should I do?
A: If this is the first time you’ve charged your watch / bracelet, please use the adapter to power it, charge it for more than 3 hours, then press the button to start it;
If you have not used the watch / bracelet for a long time without charging it, the battery would have opened the UVP function. In this situation, you need to activate the battery before using. (You can go to the phone repair shop to activate the battery).

2. Q: Why can’t I connect with Bluetooth?
A: 1. If the phone's Bluetooth version is lower than the watch's / bracelet’s, they will
not be able to pair;
2. If the phone's Bluetooth version is equal to or higher than the watch's / bracelet’s, but is initially unable to pair, then you need to clear the Bluetooth connection history on the phone, scan and re-connect again.

3. Q: The watch / bracelet icon shows that it has paired over Bluetooth, however the APP cannot sync data. How do I resolve this?
A: Generally it is caused by the Bluetooth of the phone. Please close the APP first, restart the Bluetooth connection and re-pair the two devices. If the above step does not work, please restart your phone and try to pair the devices again.

4. Q: Why does my watch / bracelet frequently lose connection with my phone?
A: Please check if your phone or other security software has set the APP as a trusted APP or not. This is required to pair the two devices. If it hasn’t, please set it as trusted APP and try again.

5. Q: Why am I unable to connect with the APP?
A: Please making sure the OS of your phone is within the range that the smart watch / bracelet supports.

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Customer Reviews

4.73 out of 5
  • 11
  • 4
  • 0
  • 0
  • 0
See all 15 reviews Write a Review
  • Olukunle
    Yes (0) Color: Black
    Positive Gearbest Order Review.
    I am proud to become a great customer of Gearbest because they sell great guaranteed products with secure checkout options and awesome reliable safe shipping without delay or damage. I recommend Gearbest to anyone who is willing to purchase good products with great values.
    Suggestion
    N/A

    May 12,2016

  • VladPiero
    Yes (1) Color: Black
    Dfit - D21 Fitness Band
    * Excellent built quality
    * Big touch screen
    * Strong and soft silicon band
    * Many functions
    Suggestion
    * Perhaps a bit expensive

    Apr 29,2016

  • Marin
    Yes (0) Color: Pink
    D21 Bluetooth 4.0 Heart Rate Monitor Smart Bracelet Watch
    D21 Bluetooth 4.0 Heart Rate Monitor Smart Bracelet Watch
    Cool
    Easy to use

    Practical
    Honest price
    Suggestion
    none

    Jul 29,2016

  • Fredrik Gren
    Yes (0) Color: White
    Average smartband with some nice features
    Real time HR-monitor
    Text notifications from your phone (sms, contact name etc)
    Suggestion
    Battery time
    Not so exact step counting
    A bit buggy app (android) that doesn't work with other apps notification etc.

    Oct 16,2016

  • Barbara
    Yes (0) Color: Purple
    Human
    It was easy to set up on my phone, I liked the app that came with it. It was good quality and fit comfortably.
    Suggestion
    The battery life wasn't as long as I would have liked.

    Oct 29,2016

  • Mauro Galante
    Yes (0) Color: Black
    mr
    good built quality
    Big touch screen
    Strong and soft silicon
    Many functions
    Suggestion
    none

    Sep 01,2016

  • TE
    Yes (0) Color: Purple
    Review
    the color is beautiful. the material is strong and flexible.
    Suggestion
    the app is slow and poorly made

    Feb 10,2017

  • carlos bonilla
    Yes (0) Color: Pink
    D21 Bluetooth 4.0 Smart Bracelet Watch
    básico pero buen smart watch. contento por su funcionalidad
    Suggestion
    problemas con el app, pero nada del otro mundo

    Oct 06,2016

  • Mihai Anghel
    Yes (0) Color: Black
    bratara fitness
    Se comporta excelent initial am crezut ca nu functioneaza, dar am copiat aplicatia in telefon. Este OK. RECOMAND.
    Suggestion
    Deocamdata nu am ce sa spun negativ.

    Jul 23,2016

  • Tomáš
    Yes (0) Color: Black
    D21 Bluetooth 4.0 Smart Bracelet Watch
    Vše v pořádku. Jsem spokojen s produktem................
    Suggestion
    Zatím nemám nic proti....................................

    Mar 26,2017

FAQ for D21 Smart Bluetooth Watch for Android iOS

Customer Questions & Answers

  • All(34)
  • Product Information(32)
  • Stock Status
  • Payment
  • About Shipping(1)
  • Others(1)
Q

hi, will it measure HR while doing pilates or HIIT, not only when running and/ or walking?

By Anja Apr-17/2017 16:19:25

A

Hello Anja,
When you measure your heart rate,you need to keep in a stationary state.If you have been exercising,you may not be able to test or test inaccurately.

Q

The bracelet give you the heart rate? Or do you need a separate band?

By fernando Feb-15/2017 20:16:55

A

Hello fernando


Thank you for your inquiry.

You do not need a separate band.

It supports hear rate function. 

Thank you, Let me know if you need any help.

Have a nice day!


Q

is this wristband compatible with endomondo? Thank you

By Miroslav Feb-10/2017 10:21:52

A

Hello Customer,

The answer is no.

Q

can it track count calories?

By giorgi laluashvili Jan-15/2017 08:37:09

A

Hello giorgi,
• Calorie consumption management: Calculate the consumption of calorie, record the daily burned calorie.

Q

If the wristbands are changeable where can I buy others of other colors?

By João Matos Dec-21/2016 21:26:24

A

Hello  João,  
Battery: 3.7V 500mAh ( built-in ) 

Thanks for your inquiry.


Q

Is it compatible with windows 10 mobile? Can i Download the apk from windows store

By Rodrigo Damaso Dec-14/2016 12:05:32

A

Hello Rodrigo,


Sorry. It does not compatible with Windows 10, it supports Android 4.3, iOS 7.0 and above system.

Thanks for your inquiry.

Q

Is the software upgradable? Currently the watch cannot display international characters so some notifications are not readable or messed up, if they contain i e Swedish characters åäö ÅÄÖ

By Klas Dec-08/2016 16:08:18

A

Hi Klas,


Thanks for your inquiry.

The software cannot upgradable.

Have a nice day!

Q

is it compatible with windows phone? Has the bracelet also chronometer ? Thank you

By Paolo Nov-12/2016 22:11:00

A

Hello Paolo,

Yes, the item is compatible with windows phone.

The item also have chronometer.

Q

Buongiorno, è possibile veder il numero dei passi e la frequenza cardiaca nel display del bracciale senza dover aver il cellulare a presso?

By Vale Nov-08/2016 10:28:40

A

Hello Vale,
You can only see the data on the APP,  can not see it on the Bracelet Watch.

Q

1- How to make it track sleep? 2- How to turn off notification at night? It wakes me up at night by vibration every time i receive an email or msg or call. Other bracelets has the feature to turn on sleep mood so it stops the notifications. 3- How to make it light up only when I touch the screen not every time i move my wrist?

By viviane Oct-25/2016 20:35:46

A

Hello viviane, 


Thank you for your inquiry.

1, open the bracelet sleep detection function, wearing the watch during sleep.You can see sleep detection data in the mobile phone APP next day.

2, set the APP side to close the message alert on it, or directly close the phone Bluetooth, hand ring and mobile phone will be disconnected, you will not receive a message alert;

3, this bracelet does not have lift the wrist bright screen function, the screen will not always bright, if you do not touch the screen, do not carry out any operation, the bracelet will automatically enter the standby state.

Have a nice day!

Q

hi, will it measure HR while doing pilates or HIIT, not only when running and/ or walking?

By Anja Apr-17/2017 16:19:25

A

Hello Anja,
When you measure your heart rate,you need to keep in a stationary state.If you have been exercising,you may not be able to test or test inaccurately.

Q

is this wristband compatible with endomondo? Thank you

By Miroslav Feb-10/2017 10:21:52

A

Hello Customer,

The answer is no.

Q

can it track count calories?

By giorgi laluashvili Jan-15/2017 08:37:09

A

Hello giorgi,
• Calorie consumption management: Calculate the consumption of calorie, record the daily burned calorie.

Q

If the wristbands are changeable where can I buy others of other colors?

By João Matos Dec-21/2016 21:26:24

A

Hello  João,  
Battery: 3.7V 500mAh ( built-in ) 

Thanks for your inquiry.


Q

Is it compatible with windows 10 mobile? Can i Download the apk from windows store

By Rodrigo Damaso Dec-14/2016 12:05:32

A

Hello Rodrigo,


Sorry. It does not compatible with Windows 10, it supports Android 4.3, iOS 7.0 and above system.

Thanks for your inquiry.

Q

Is the software upgradable? Currently the watch cannot display international characters so some notifications are not readable or messed up, if they contain i e Swedish characters åäö ÅÄÖ

By Klas Dec-08/2016 16:08:18

A

Hi Klas,


Thanks for your inquiry.

The software cannot upgradable.

Have a nice day!

Q

is it compatible with windows phone? Has the bracelet also chronometer ? Thank you

By Paolo Nov-12/2016 22:11:00

A

Hello Paolo,

Yes, the item is compatible with windows phone.

The item also have chronometer.

Q

Buongiorno, è possibile veder il numero dei passi e la frequenza cardiaca nel display del bracciale senza dover aver il cellulare a presso?

By Vale Nov-08/2016 10:28:40

A

Hello Vale,
You can only see the data on the APP,  can not see it on the Bracelet Watch.

Q

1- How to make it track sleep? 2- How to turn off notification at night? It wakes me up at night by vibration every time i receive an email or msg or call. Other bracelets has the feature to turn on sleep mood so it stops the notifications. 3- How to make it light up only when I touch the screen not every time i move my wrist?

By viviane Oct-25/2016 20:35:46

A

Hello viviane, 


Thank you for your inquiry.

1, open the bracelet sleep detection function, wearing the watch during sleep.You can see sleep detection data in the mobile phone APP next day.

2, set the APP side to close the message alert on it, or directly close the phone Bluetooth, hand ring and mobile phone will be disconnected, you will not receive a message alert;

3, this bracelet does not have lift the wrist bright screen function, the screen will not always bright, if you do not touch the screen, do not carry out any operation, the bracelet will automatically enter the standby state.

Have a nice day!

Q

Hello, Is it possible I use the heart rate monitor with another app? Like Caledos Runner from Windows Phone? Tks

By Joao Roberto Sep-08/2016 14:19:25

A

Hello Joao,

Sorry that you can't use the heart rate monitor with another app. It only works with the app designed by the supplier. Thanks for your attention. 

Be the FIRST to Ask a Question. Want GB Points? Just Write a Review!

Be the FIRST to Ask a Question. Want GB Points? Just Write a Review!

Q

hi, i live in colombia. How many days i have to wait to have the product? i appreciate your answer.

By Carlos Bonilla May-28/2016 01:54:31

A

Hello Carlos,
We generally require between 3-7 business days to arrange shipment upon payment. The exact processing time varies depending on the item.
Please refer to our shipping estimation below:
A. Expedited Shipping: Around 3-7 business days to arrive.
B. Standard Shipping: Between 7-10 business days to be delivered.
C. Flat Rate Shipping: Between 10-25 business days to be received.
For more shipping details http://www.gearbest.com/about/shipping-methods.html

Q

The bracelet give you the heart rate? Or do you need a separate band?

By fernando Feb-15/2017 20:16:55

A

Hello fernando


Thank you for your inquiry.

You do not need a separate band.

It supports hear rate function. 

Thank you, Let me know if you need any help.

Have a nice day!


34 Questions & Answers View all>

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