This bicycle speedometer is made of durable plastic, won't burden your bike and not easy to break. With IPX-6 waterproof performance, 2.8in big LCD screen with backlight and multiple functions available, this speedometer is perfect for riding data measurement. Features: Made of high-quality plastic, lightweight and durable, won't burden the bike and not easy to break. IPX-6 waterproof, effectively prevent rain drops and water splash, can be used in even rainy days. 2.8in LCD screen with backlight function is clear at night but no reflection during the day, comfortable and easy to read when cycling no matter in day or at night. Intelligent wireless speedometer with memory function, wont lose your data even the battery runs down. Multiple functions available, can measure speed, distance, riding time, temperature, etc. Connect with 2 bikes at the same time and interchange the data freely. Specifications: Material: Plastic Backlight Color: Green / White(Optional) Size: 5 * 7.5 * 1.2cm / 1.9 * 2.9 * 0.4in Screen Size: 2.8in Weight: 43.8g / 1.5oz IPX Level: IPX-6 Package Weight: 180g / 6.3oz Package Size: 10 * 10 * 10cm / 3.94 * 3.94 * 3.94in Powered By: 1 * CR2032 Battery Package List: 1 * Speedometer 1 * CR2032 Battery 1 * Wireless Sensor 1 * Mount Seat 1 * Magnet 2 * Foam Cushion 6 * Nylon Bands 1 * Instruction