Features： 1、Smart microcircuit, stable function: Automatic memory and updated every weekly, powerful microcircuit; more stable function more correct data; longer service life. 2、Day & Night backlight: green & white color on the odometer display to distinguish between day and night. Please note the slight rattle sound from device is normal appearance, which results from the design of wireless automatic function. 3、Made of quality material with fine process, lightweight, portable, durable, waterproof, resistant to high and low temperature. The screen is luminous and clearly display the time, average speed, maximum speed, distance, etc. 4、Daily waterproof: Do not put the product into water or get wet in the rain for a long time. Cover a plastic warp when there is a bad weather. 5、Wonderful accesory for mountain bike, road bike. Specification： Item type: Bike Wireless Odometer Material: PVC Weight: Approx. 94g Color: As picture shown Size: Approx.  62x38x14mm/2.4x1.5x0.6in Battery: 2 x CR2032 battery Language: English, German, French, Dutch, Spanish  Waterproof: daily waterproof Installation location: handlebars Package List： 1 x Bike Wireless Odometer 1 x Bracket 1 x Sensor 1 x Magnet 2 x Sponge mat 1 x Rubber ring 4 x Fixing band 1 x Instruction