Ecsem 28-Function Bicycle computer waterproof Bike Odometer Speedometer, Four Windows LCD Displays with thermometer and LCD backlight in blue This new type of multi-function bicycle-odometer can display all information about the riding speed, mileage and time dynamically when riding. Easy installation, good durability, 28 main functions. Powered by CR2032 battery (included). Engineering material plastics, LCD screen, electronics component. it also includes the function of thermometer, clock and stopwatch.