Eavann Wireless Bike Computer with 3 Battery, Backlight Waterproof Cycling Odometer, Temperture Auto Off Bicycle Speedometer Mutil-Function meet your riding needs-- Current/Average/Max speed, Elapsed time, Trip/Total Distance and Clock, etc. Smart design, easy install and simple operate, worry-saving riding helper, scientifically arrange cycling training. Wireless and waterproof, 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. Smart Sleep Mode: If more than 300s doesn't receive the signal, the computer enter into Sleep Mode to save power, the CLK value remains stored. 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.