EConcept Waterproof Digital Backlight Bicycle Computer Odometer Speedometer Clock Stopwatch Bike Computer Bicycle Accessories Multifunctional, includes all vital functions for novices and pros alike. Easy to read, big four-line backlight LCD display. Durable and waterproof for use in all conditions, can be totally soaked in water. Easy installation, no tools required. Powered by CR2032 battery. Ideal companion for your riding.