ModelZeblaze GTR Bluetooth VersionBluetooth 5.1 ChipGoodix GR5515 Water resistant30 meters Screen Size1.3 inch Screen type2.5D Glass and IPS Full Round Color Touch Screen Compatible OSAndroid andamp iOS CompatabilityAndroid 4.4 or iOS 9.0 and above system SensorHeart-rate sensor, Proximity sensor, Accelerometer. Type of batteryLithium polymer battery Battery Capacty:180 mAh Standby time30 days (Power-saving Scenario) 18 days (Typical Usage Scenario) Charging timeAbout 1.5 hours Standout FeaturesAll-day Heart Rate Monitoring (Abnormal Heart Rate Alert), Blood Pressure Monitoring, 10 Goal-Based Exercises, Female Cycle Tracker, Sleep Quality Monitoring, Steps Tracking, Calorie Burn Tracking, Daily Steps Goal, Real-time Pace andamp Distance, Goal Celebrations, Reminders To Move, Smartphone Notifications, One-click Reject or Mute, Weather Forecast, CountDown andamp Stopwatch, Alarm Clock, Multi-watch Faces, Find Phone, Turn Wrist Detection, Music Control, Shake Take Photo. Case materialMetal Body Bezel material2.5D Glass Band materialSilica Gel Dial size45x45x11.6mm Product weight51 g Package weight210 g Package size (L x W x H)145x90x28 mm Package contents1 x GTR, 1 xStrap, 1 x Cable, 1 x User Manual (English, Deutsch, Espaandntilde ol, Portuguandecirc s, Franandccedil ais, Japanese .)