MIFIT APP supports Android 4.4+, iOS 9+<br> Weight: 22.1 g <br> Wristband Size: 18mm<br> Water Resistance: 5 ATM (50 meter)<br> Display: 0.95” AMOLED 120x240 RGB Touchscreen<br> Battery Life: up to 20 days with 135mAh battery, charge in less than 2 hours<br> <br> Sensors<br> 3-axis accelerometer + 3-axis gyroscope<br> PPG Heart rate sensor<br> Proximity Sensor<br> <br> All Features<br> Workout completion notifications, goal setting, sleep monitoring, heart rate monitoring, all-day heart rate checking, resting heart rate, heart rate chart, idle alerts<br> 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<br> <br> Inside the box: <br> 1 x Mi Band 4<br> 1 x Black Silicone Wristband<br> 1 x Charging cradle<br> 1 x User Manual<br>