only 2 months used with great care...not a singel scratch....no problem..all okk....original watch+box+charger+extra magnetic strap  ... 
Mi Smart Band 4
Specifications
Weight22.1g

Water Resistance Rating5 ATM

Display TypeAMOLED

Screen Size0.95"

Resolution120 x 240 RGB

Colour Depth24bit

Screen BrightnessUp to 400 nits (max brightness), brightness adjustable

Touchscreen typeOn-cell capacitive touchscreen

Screen protection2.5D tempered glass with anti-fingerprint coating

ButtonSingle touch button (wake up, go back)

Wrist strap typeRemovable wrist strap
(Mi Smart Band 4 is compatible with Mi Band 3 straps)

Wristband width18mm

Wrist strap materialThermoplastic polyurethane

Adjustable wrist strap length155-216mm

RAM512KB

ROM16MB

Sensors3-axis accelerometer + 3-axis gyroscope;
PPG heart rate sensor;
Capacitive proximity sensor

Wireless connectivityBT5.0 BLE

BatteryLiPo, 135mAh

Charging Type2Pin Pogo Pin

Charging time≤ 2 hours

Standby timeUp to 20 days

Motor TypeRotor

Body materialPolycarbonate

AppMi Fit

System requirementsAndroid 4.4, iOS 9.0 or above

Features
Sport Functions6 workout modes: Treadmill, exercise, outdoor running,
cycling, walking, pool swimming; Count steps, distance,
and calories burned

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

Other featuresAlarm, 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                                    

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