Kool(TM) Black Wireless Bicycle Bike Speedometer Waterproof Mountain Cycling Computer Speedo Odometer Easy to install. Waterproof. Small size, light weight, stylish design. Large LCD Computer display, easy to read. Fits all bike sizes. Wireless system, great for suspension forks. Wireless distance between sender and receiver is approx. 1 meter. Batteries, instructions and fitting accessories are included. Monitor your bicycle's speed, distance, riding time, etc. Clock: 12/24H format is selectable.Metric and Imperial speeds mph/kph are selectable.Speedometer with digit display & image display.