Mi Smart Band 4

Water Resistance Rating:5ATM

Display Type:AMOLED

Screen Size:0.95 inches

Resolution:120 x 240 RGB

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 length155-216mm

Sensors:3-axis accelerometer + 3-axis gyroscope;
PPG heart rate sensor;
Capacitive wear monitoring sensor

Wireless connectivity:Bluetooth 5.0 BLE

Battery:LiPo, 135mAh

Charging Type:2-Pin Pogo Pin

Charging time:≤ 2 hours

Standby time:≥ 20 days

Body material:Polycarbonate

App:Mi Fit

System requirements:Android 4.4, iOS 9.0 or above

Sport Functions:6 workout modes: Treadmill, exercise, outdoor running,
cycling, walking, pool swimming; Count steps, distance, and
calories burned

Health monitoring:Workout completion notifications, goal setting, sleep monitoring,
heart rate monitoring, all-day heart rate checking, resting
heart rate, heart rate chart, idle alerts

Other features:Alarm, pre-set watch face, customizable watch face, lock screen, timer, stopwatch, phone alarm and notifications, incoming calls, message notifications, calendar notifications, app notifications, weather forecast, Find my phone, phone unlock, event notification, Night mode, Do not disturb mode (works even without phone), music controls on band, battery level display, OTA updates