Orders of 2 or more will receive a free gift.Product Description Material: ABS Size: 4.6 * 4.6 * 1.8 cm Colour: Bla Display: LCD display Balight: Green/White Features: wireless automatic wake-up Power supply: 1 CR2032 button battery on the meter head; 1 12V 23A battery for the transmitter Quantity: 1 pcs Paage content: 1 pcs * ycle odometer 1.Auto Wake-up FunctionAutomatically wakes from sp mode upon sensing vibration in the ycle. Bright LCD display to easily view ride statistics. 2.Multi-functionsSmall size, light weight, wireless, waterproof design makes it convenient and durable. This ycle computer measures speed, distance, and riding time. Exactly what any serious yclist or fitness fanatic needs to know for stats traing. 3.Day & Night Balight Provides balight for easy viewing during dark hours. The balight 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. 4.Easy to Install &UseSimple installation that only takes a few minutes. Easy to navigate f with only two buttons to access all measurements. mizable to most common tyre sizes for accurate stats traing. 5.ApplicableRoad ycles, mountain bikes, folding bikes,and other common ycles are compatible with this ycle computer. This ycle computer MAY NOT be compatible with some electric-assist ycles. 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.