Mountain Bike Stopwatch, Bicycle Odometer The product is shipped based on the color or size of the main image of the product page. Auto Wake-up FunctionAutomatically wakes from sleep mode upon sensing vibration in the bicycle. Bright LCD display to easily view ride statistics. Multi-functionsSmall size, light weight, wireless, waterproof design makes it convenient and durable. This bicycle computer measures speed, distance, and riding time. Exactly what any serious bicyclist or fitness fanatic needs to know for stats tracking. Day & Night Backlight Provides backlight for easy viewing during dark hours. The backlight will automatically turn on when any button is pressed between 18:00 and 06:00. Please note the slight rattle sound from device is normal phenomenon, which results from the design of wireless automatic function. ApplicableRoad bicycles, mountain bikes, folding bikes,and other common bicycles are compatible with this bicycle computer. This bicycle computer MAY NOT be compatible with some electric-assist bicycles. If the computer display, sensor, and magnet can be installed within the specified distances device should be fully compatible. Please do not hesitate to contact us with any questions.