Mi Band - A fitness tracking wrist band that monitors your fitness and tracks your sleep. Featuring the industry's most power-efficient Bluetooth chip and accelerometer, the Mi Band can be powered for 30 days on one charge, and also doubles up as an alarm clock. 

Mobile phone calls reminding function.
With your MI4, MI3 or Hongmi Note 4G Version, you can find so many funny things from it.
30 days duration, waterproof, Automatic looking for itself, Unlock your phone without a password... So many greatful function, it is just for you.

When you enter the sleep state, Xiaomi band began to records.
Automatic sleep monitoring, it knows that if you sleep well. And keep track of your sleep time, from it, you can learn more about the quality about your sleep.
Smart vibration alarm, simulate the state of nature to wake.

Record your movement data throughout the day.