Ohuhu Wireless Bike Computer Odometer Speedometer with LCD Backlight for Cycling 15 Functions - Current speed, odometer, trip distance, maximum speed, average speed, trip riding time, clock(12H/24H), scan, "+" "" comparison of average speed, maintenance alert, KM/hr , M/hr selectable, setting tyre circumference (0-9999mm), setting ODO, freeze frame memory, and auto off. Back Lights - [Automatically turns on between 18:00 - 06:00.] Allows bicyclers to read the cycling data at night. Auto Off - After 300 seconds no signal inputs the computer, the screen will turn into OFF state with only clock displays on it. It will be restart only when you press the key. Wireless Set Up & Tool-free Installation. [Requires 1 CR2032 battery (Included)] Rainproof & Shock Resistance - Bears the wear and tear of the harsh outdoors.