Specification: Color : Black, Red Material : Nano-galvanized titanium alloy Movement Model : MTK2503 Continuous talk time : About 5 hours Standby time : 180 hours Screen Size : 1.26Inch Translucent TFT Round Screen HD Screen Type : Touch Screen OGS Capacitive Screen Resolution: 320*320 Polymer battery capacity: 450mAh Waterproof level: IP68 waterproof Bluetooth version: 4.0 Bluetooth receiving distance: about 10 meters Bluetooth connectivity support: Android, Apple Frequency band network: 3G WCDMA 850/2100 Voltage :DC 5V Applicable platforms: Android, IOS The main function: Swimming wearable; GPS Beidou LBS triple positioning; Compass sport track; Strap can be replaced; Under the sun see no pressure screen; running riding walking three kinds of sports mode heart switch; heart rate, step