Features: 2.20 Inch Large Screen Durable Titanium Alloy Case Large capacity Battery Personal Health Assistant Bluetooth Call IP68 Waterproof Level GPS tracking More (Scroll Down to Know) Specification : Brand : Zordai Model: ZD8 Ultra Max Compatible System: IOS / Android System app: ZORDAI Chip: AX Flash size: 128mb Android OS: Supports Android 4.4 and above IOS: Apple iOS 10.0 and above Heart Rate Sensor: Zhangheng BD1662_I2C Bluetooth: Dual Bluetooth 5.0 Waterproof Level: IP68 Craftsmanship: zinc alloy IML Product :weight 48g