Features:  1. It adopts GPS active antenna, which has better signal receiving ability and faster positioning compared with ordinary passive antenna. And GPS cold boot can be completed within 1 minute.  2. The cycling computer has IPX6 level waterproof performance, support for use in rainy weather. Anti-dazzling screen is also great for riding under strong sunlight. no matter rainy or sunny, the cycling computer has always loyally accompanied your cycling.  3. With 1.9 inch screen, It's easier to see the information on the screen quickly and clearly during the day and night;  4. It supports BLE5.0, and can quickly synchronize data to mobile phone;    Specification:  Model: CC400;  Material: Aluminium alloy+ABS;  Size: 70.2x44.8x20.9mm;  Weight: 55g;  Screen size: 1.9inch;  Positioning: beiDou+GPS+Glonass+Galileo;  Waterproof: IPX6;  Battery Life: 20+hrs;  BLE/ANT+;  BLE5.0/ANT+;  Language: English;  Speed sensor: BLE 5.0/ANT+;  Cadence sensor: BLE 5.0/ANT+;  Heart rate sensor: BLE 5.0/ANT+;  Charge Time:about 1.5hrs full charge;    Package included:  1 x Bike Computer