Mi Smart Band 4 Smart Watch

Weight 22.1g

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

Sensors3-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 TypeRotor

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, proximity sensor, 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, Bluetooth broadcasting, battery level display, different
ways to wear, OTA updates