Mi Band is a smart bracelet from Xiaomi with lots of useful features. Mi Band connects to your smartphone via Bluetooth and can work for 30 days with no need to recharge.

This new modification of Mi Band has a new feature — the heart rate monitor.

During aerobic exercises the heart rate sensor allows you to control the pace, the heart rate, to handle  the state of your movement at every moment, and to generally improve the work of the heart and as a result of correct load — to increase the volume of the lungs.