Features:Display: 1.64 inch Rectangle AMOLED Touch DisplayResolution: 280 x 456 pixel | 326 PPIBrightness: up to 500 nits, adjustableTempered glass with anti-fingerprint coating | 2.5D micro-curved glassBand Faces: 150+Approximately 84% larger visible areaFitness: 110+ fitness modes | Built-in GNSSHealth: Heart rate monitoring | SpO tracking | Sleep Tracking | Female health tracking | Stress monitoring | Deep Breathing exercisesGeneral Features:Resistant: 5ATM water resistantBattery Life: 12 Days battery LifeMore Useful feature: Music playback | Stats | Exercise Record | Workout | Events | Do Not Disturb | Alarm | Weather | FlashlightOperating system: Android 6.0 or higher, iOS 12 or higher | Bluetooth 5.2 BLEBand Strap Size & Material: 130 mm-205 mm | TPU | POM BuckleDimensions: H= 44.7mm Width= 28.8mm Thickness= 11mm (exclude the strap and protrusions)Weight: 20.5g (without strap)Specification:5ATM water resistantApp: Mi FitnessBluetooth 5.2 BLEOperating system: Android 6.0 or higher, iOS 12 or higher