Bike Computer Wireless Universal 16 Functions Waterproof with Backlit Display,Automatic Start/Stop, Bike Speedometer,Bicycle Computer Features Handy, Compact and Portable. Easy to install, easy to read LCD display, ideal companion for your bicycleCompact appearance design, multi-function stopwatch is economical Large screen large font, provide two backlight modes (long light / short light), which are clearly visible even in the sun, and the data is more convenient and safer to see. The analog coded radio used for the speed transmitter can reach a range of 60 cm and you get reliable data on speed, distance, time, etc. every time you drive.Provide 3V CR2032 battery with up to 400 hours of battery life, which is more suitable for long distance driving. Equipped with a new improved chip, the transmission speed and stability are significantly improved.No operation required, as long as there is a motion signal input, the stopwatch will start working automatically and you can record your trajectory at any time.Predefined tire size, custom KM / M selection, backlighting, current speed, maximum speed, driving time, automatic start / stop and other 16 technical support.Product nameSD-546C luminous wireless bicycle computerMaterial Engineering plastic ABS electronic componentsDisplayLCD displaySize 4.6*4.6cm/1.8x1.8inPower supply 1 CR2032 button battery on the meter head; 1 12V 23A battery for the transmitterColour: BlackBacklight Green light/white light Package Include: Odometer*1, wireless rotating base*1, magnet*1, cable tie*4, rubber ring*1, manual*1, wireless transmitter*1