This speedometer is your bike board computer. It has LCD backlight and shows real-time statistics for current speed, odometer, trip distance, maximum speed, average speed, total trip time, & has stopwatch. It is super easy to install, you don't even need special tools for it. Works with 1 x CR2032 button battery (Included in the package).
Size (L x W x H): 5.50 x 4.00 x 2.00 cm / 2.17 x 1.57 x 0.79 inches