Parameters and main functions System: Android 5.1 CPU: MTK6580 RAM/ROM: 512M/4G Camera: 2M Screen size: 1.39 inch Resolution: 400*400 pixel Bluetooth: V4.0 Location: GPS SIM card: Support Network: WIFI,3G WCDMA 850/2100MHz;2G GSM850/900/1800/1900MHz Battery: 400mAh 3.7V Color: Black,White,Golden,Red Waterproof: Life waterproof Main functions: SMS Caller ID display Steps recorder Sedentary alarm Sleep monitor Heart rate monitor Remote control camera Remote control music Info bluetooth sync Google map