Specifications:It is made of premium quality ABS material which makes it very safe and durable.Meanwhile, this odometer is waterproof so it is very convenient for you to use it in rainy days.Furthermore, due to its special light-controlled smart backlight feature, you can use it both at day and night.Additionally, it has constant backlight and low battery reminder functions which makes it very secure for you to use.Also, it is very easy to install and is suitable for most of the bicycle models.Therefore, it would absolutely be a perfect tool for your bike.Item Name: Bicycle SpeedometerMaterial: ABS, Electronic ComponentsFeatures: Waterproof, Backlight Odometer, Low Battery ReminderSize: 9cm x 4cm x 1.5cm/3.54" x 1.57" x 0.59" (Approx.)Notes:Due to the light and screen setting difference, the item's color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x Bicycle Speedometer1 x Bicycle Speedometer Table Base Sensor1 x Magnet6 x Ties1 x Instruction1 x CR2032 Button Battery for Bicycle Speedometer (Included)1 Set of Multifunctional Bracket