Bike Odometer and Speedometer Wireless Bike Computer High Clear LCD IPX6 Waterproof 30-Hour Battery Type-C Charge Bicycle Computer Wireless   Material: PC+ABS for the body, Silicone for the bands Display: 3.0-inch TN LCD, 56mm x 43mm (2.20in x 1.69in), Monochrome Backlight: White for enhanced visibility during night rides Transmitter Frequency: 125KHz for dependable data transmission Battery: 120mAh rechargeable battery, 3.7V / CR2032 button cell, 240mAh, 3.2V for extended use Charging Time: 2 hours for a full charge Battery Life: Up to 30 hours on a single charge Movement Speed: Accurately tracks speeds up to 50mph / 80km/h ODO METER: Tracks total distance traveled Auto ON/OFF: Conserves battery life by automatically turning on/off Size: 76 x 51 x 19mm /2.99 x 2.01 x 0.75in Weight: 80g / 100g (2.79oz / 3.53oz)