SUNDING Wireless Bike Bicycle Cycling Computer Odometer Speedometer LCD Backlight Backlit Waterproof Multifunction 100% brand new and high quality Multifunctional, includes all vital functions for novices and pros alike. Easy to read, big four-line backlit LCD display. Easy installation, no tools required. Durable and waterproof for use in all conditions, can be totally soaked in water. Powered by CR2032 battery. Ideal companion for your riding.