Features1Smart microcircuit, stable function: Automatic memory and updated every weekly, powerful microcircuit; more stable function more correct data; longer service life. 2Day & 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. 3Made 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. 4Daily 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. 5Wonderful accesory for mountain bike, road bike.SpecificationItem type:Bike Wireless Odometer Material: PVCWeight: Approx. 94gColor: As picture shownSize: Approx.62x38x14mm/2.4x1.5x0.6inBattery: 2 x CR2032 batteryLanguage: English, German, French, Dutch, SpanishWaterproof: daily waterproofInstallation location: handlebarsPackage List1 x Bike Wireless Odometer1 x Bracket1 x Sensor1 xMagnet2 x Sponge mat1 x Rubber ring4 x Fixing band1 x Instruction