Xiaomi Mi Band 2 smart watch has OLED screen for displaying time, number of steps, heart rate Battery life is 20 days, IP67 waterproof, standard support for Bluetooth 4.0, silicon strap and Hypoallergenic.
Lithium polymer 70mAh Cpacity Standby time:20 days
Display
0.42" OLED display
Connectivity
Bluetooth 4.0 BLE
SpecialFeatures
Water-resistance IP67 Power-efficient accelerometer Photoelectric heart rate sensor Phone unlocking Any device running Android 5.0 and above with Bluetooth 4.0