� Multi function - 16 functions to meet your different riding needs: SPD CURRENT SPEED, ODO ODOMETER, DST TRIP DISTANCE, MAX MAXIMUM SPEED, AVS AVERAGE SPEED, TM TRIP TIME, CLK CLOCK, Scan, "+"''-"COMPARATOR, SETTING TYRE CIRCUMFERENCE, FREEZE FRAME MEMORY, SETTING SPEED SCALE, SETTING THE LAST VALUE OF ODOMETER / ODO, SIGNAL INTERFERENCE-RESISTANCE, AUTO ON/OFF, BACKLIGHT etc. Scientifically arrange your cycling life, comfortable and user friendly. � Modern-day, cutting edge wireless bicycle computer complete with an easy-to-read LCD display. The large LCD display guarantees you can read your statistics easily. Pls note the slight rattle sound from device is normal phenomenon, which results from the design of automatic function. � Wireless and waterproof design makes it more convenient and durable. Long gone are the days of a bunch of ugly, tangled wires on your handlebars, and no need to worry about rain. � The backlight can be set in either green and white color, and the light will turn on when press any button during 19:00pm and 7:00am. Built-in steel ball switch that will shake when receiving signals, computer will be automatic awake from sleeping mode. In the mean time you may hear slight rattle from the device. It's common phenomenon as steel ball is working. No worry about it. � Suitable to all types of bicycles: road cycling, mountain biking, folding bike, common bicycle.Perfect device can also be used for hiking, climbing, and many other fun, adventurous outdoor activities.