Display；0.95" AMOLED Display, 120*240 Pixels
Battery：135mAh battery compacity,Up to 20 days (Recharging time ~2 Hours)
Water resistance：5ATM water resistance up to 50m
RAM+ROM：512K RAM+16MB ROM
Activity Tracking： Count steps, distance, calories burned
Healthy monitoring： 24/7 Heart rate monitoring
Sensor：3-axis accelerometer, 3-axis gyroscope,
Connective： Bluetooth 5.0
System requirement：Android 4.4, IOS 9 and above
Other Features:
1.Stopwatch/2.Alarm clock/3.Timer/4.Find my phone/5.Phone unlock/6.Event reminder/7.Do not disturb mode/8.lock screen/9.music control on band

Package Contents:
Mi smartband 4 * 1
Wrist strap * 1
Specialized charging cable * 1
User Manual * 1