D21 Bluetooth 4.0 Heart Rate Monitor Smart Bracelet Watch Review

In today’s busy life, we are all forgetting to take care of our health by doing exercises frequently and having proper sleep. Even we are aware of the need for our health and fitness, we are forgetting them without our ignorance. A good friend can remind you about all these things and can join you in all tasks. But, if you don’t have such a good friend who staying with you all the time, the D21 Bluetooth 4.0 Smart Bracelet Watch will be the best choice that you can make.

D21 Bluetooth 4.0 Heart Rate Monitor Smart Bracelet Watch is a virtual partner which can monitor your day to day activities by sticking with you all the time. The device will monitor your Heart rate and Sleep, Remind you to have a rest and Track your sports, Measure your daily walking distance, Calculate the consumption of calories, Record the daily burned calories, Notify you when you received a call or message and do many more things to make your daily tasks simpler and effective.

It is an all in one smart watch that can be your fitness and health doctor by tracking your exercises and by notifying you about the calories burned. The useful set of features can always make you aware of all your daily tasks alongside being a good alarm to make you sleep well. It will be with you in your walks, running, exercises, sports events, swimming (because it is waterproof), and even sleeping. There are much more to explore about the device. So, let’s have a look at them

Design and Build Quality


The D21 Smart Bracelet Watch is designed in such a way that to provide a good comfort on hand when even doing extreme sports. The wristbands are made of soft Silicone material to provide a nice grip as well as the comfort. The case of the band is made of Stainless steel to provide good strength to the body. An OLED screen is well attached to the case that outputs a nice look.

The device is Available in 4 color variants as Black, Pink, Purple, and White. As it is weighing only about 30g, you will never feel you have the band on your hands. The nice feel and look of the device increase the popularity to a great extent. Waterproof body helps the band to be with you even on your swimming sessions as well as in extreme sports. So that you don’t have to remove it from your hand.



The D21 Bluetooth 4.0 Heart Rate Monitor Smart Bracelet Watch power packs a set of useful features that can considerably increase the productivity of your day to day activities. It consists of a Phone call reminder that will notify you about the phone calls using the Bluetooth 4.0 Technology, A Messaging reminder which using the same technology, Heart rate monitor that measure your heart rate, Pedometer that tracks your travels, Sedentary reminder, and a Sleep monitor to give you proper sleep.

All these features will be outputted with the help of the LED indicators and the Ring/Vibration functions on the device. There is also an alarm that vibrates on your hand without disturbing others. If you are sleeping, the wake-up alarm will only make you wake-up without disturbing others. The smooth alarm won’t hurt your hands, but it is enough capable to make you feel it.

The D21 Smart Bracelet Watch uses an 80mAh Polymer battery that can standby for 3-4 days from a single charge. The charging can be done within 60 minutes using the Ultra-fast charging Technology. As it is compatible with almost all Android and iOS versions, you could easily pair it with your smartphone to get notifications on calls and messages. You will never again miss a call or SMS if you have D21 Smart Bracelet in your hand.


  • Good Design
  • WaterProof
  • Quick Charging
  • Lite Weight
  • Different attractive color options
  • Long Standby


  • No call answering or SMS services


If you are looking for a perfect partner who can remind you all the daily tasks and can track them even your sleep, the D21 Bluetooth 4.0 Heart Rate Monitor Smart Bracelet Watch will be a good option for you. As it is a waterproof device, you can even use them in your swimming sessions. It is mostly recommended to those who are very lazy in tracking and maintaining their exercises and sleep. So, giving it a try may be a good choice.

Buy GB D21 Smart Watch

D21 Bluetooth 4.0 Heart Rate Monitor Smart Bracelet Watch Review
8.8 Overall
Build Quality8.5


Muhammed Swalih is a Blogger by profession who also has a great taste in Web Development, SEO, Graphic Designing, etc.

  1. Reply
    Cindy Mar 15, 2017 at 5:24 am

    It’s a great watch but where the heck can I buy a replacement charger? I’ve been searching and they don’t exist! Does anyone know?

  2. Reply
    Imre Tóth Aug 12, 2016 at 12:03 pm

    Realy, this is a good bracelet, but the Hplus app is very poor. Maybe other compatible app????

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