Exlight Water Resistance Bicycle Wireless Odometer Speedometer Having Digital LCD Display with Multi Functionality (Black with Grey) Water Resistance, durable in nature, Compact in nature. Measure Total distance, speed, Average Speed, Maximum Speed in M/H, KM/H mode with lap facility, reset facility. After installing batteries, first, setting wheel size, then setting km/h or m/h. After computer is working, if the parameters need to be reset, right and left button should be both pressed for 5 seconds. Then when display appears the last wheel size number, Wheel size can be revised, after this, units of km/h or m/h can be set. Compact, Lightweight, Easy to install. Easy instruction for installing and set up in user manual Stylish design and available in multiple colours.