CYCPLUS G1 GPS Bike Computer Waterproof Speedometer Wireless Odometer Cycling Bicycle Accessories with Mount Holder Specifications: Screen size: 2.0 inch LED Product Size: 55*55*22mm Product weight: 52g Battery: 600mAh Charging Mode: Micro USB Battery life: 20 hours Charging Time: 2 hours Waterproof: IPX6 Features: 1.Dynamic GPS Positioning- This bike computer with higher sensitivity, higher accuracy, faster positioning. The GPS signal tracks your route, it will display ride time, riding distance, total riding time, total riding mileage, clock, current altitude. 2. IPX6 Waterproof and Large Battery Capacity- Wireless and waterproof design. It can work anytime in the rain. 600mAH super large capacity, the sustained working time is more than 10 hours. 3. Automatic Wireless Bike ComputerThis cycling computer will automatically enter sleep mode after 10 minutes of inactivity, it will display your last cycling data when you turn it on. Please note the extra mount holder Z1 is for 31.8mm handlebar! Settings: C4: Time zone setting. Please set the correct time zone so that the time is displayed accurately. C6: Unit Setting. Switch between KMH and MPH speed displays. C7: Recover to the factory default settings. C8: Enter the initial value of the total distance.