Cycling
Check your heart rate in real time to make sure you get the best workout
as you climb mountain roads or dash around the city.
Running
Tracks your pace and step count
Maintain a safe workout, whether you’re running short or long distance.
Swimming
5 ATM water resistant up to 50m
Recognizes 5 different swim styles
Records 12 data sets including swimming pace and stroke count
Features
Full colour display and heart rate monitor
Full colour AMOLED touch display
Activity and swim tracking
Up to 20 days battery
Health monitoring
Wristband alarm
Idle alerts
Specifications
Water Resistance Rating     5 ATM
Display Type     AMOLED
Screen Size     0.95″
Resolution     120 x 240 RGB
Colour Depth     24bit
Screen Brightness     Up to 400 nits (max brightness), brightness adjustable
Touchscreen type     On-cell capacitive touchscreen
Screen protection     2.5D tempered glass with anti-fingerprint coating
Button     Single touch button (wake up, go back)
Wrist strap type     Removable wrist strap
(Mi Smart Band 4 is compatible with Mi Band 3 straps)
Wristband width     18mm
Wrist strap material     Thermoplastic polyurethane
Adjustable wrist strap length     155-216mm
RAM     512KB
ROM     16MB
Sensors     3-axis accelerometer + 3-axis gyroscope; PPG heart rate sensor; Capacitive proximity sensor
Wireless connectivity     BT5.0 BLE
Battery     LiPo, 135mAh
Charging Type     2Pin Pogo Pin
Charging time     ≤ 2 hours
Standby time     Up to 20 days
Motor Type     Rotor
Body material     Polycarbonate
App     Mi Fit
System requirements     Android 4.4, iOS 9.0 or above