Mi Band 4 for Sale, better than new. With 6 Straps. More than 1000 watch faces. Weight: 22.1g Water Resistance Rating: 5 ATM 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) Lens 130° Wide Angle Wrist strap material: Thermoplastic polyurethane Adjustable wrist strap length: 155-216mm 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: 130° Wide Angle App: Mi Fit System requirements: Android 4.4, iOS 9.0 or above Features 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