Xiaomi Mi Band 2 is a Oval shaped Smartwatch that comes with a strap.That is going to make your life easier.It is powered by a It is backed up by a 70 mAh Battery that keeps the device running for 20 days a considerable amount of time.The Smartwatch is compatible with devices which support Android 4.4 and above,iOS 7 and higher OS.The Xiaomi Mi Band 2 Smartwatch comes inbuilt with an Accelerometer,Gyroscope,Heart rate,Light Sensor.The activity sensors on the device work together towards keeping a track of your Step count,Heart rate monitor,number of Hours slept .The Smartwatch is Water resistant and hence you need not worry about a little drizzle or sweating while working out.