Wireless Bike Computer, Wolfride Backlight Bicycle Speedometer and Odometer Track Calories Multi Function Provide necessary information for riding-- Speed/Distance/Time/Calories etc. Backlight, Waterproof, Innovative technology to ensure all-weather riding Smart design, easy install and simple operate, worry-saving riding helper Cutting-edge Technology: German chip and special material, better performance, more power saving Suitable to all types of bicycles: road cycling, folding bike, common bicycle etc.