Features: It is made of premium quality ABS material which makes it very safe and durable. This odometer is waterproof so it is very convenient for you to use it in rainy days. This odometer is wireless so is well-suited for most of the situations while you are riding your bike. Due to its special backlight feature, you can use it both at day and night. 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. Specifications: Color: Black,Yellow,Blue Style: Wireless,Wired Material: Plastic Battery: CR2025(Include) Item Size: 7.3*4.5cm/2.2*1.6in Package Weight: 160g Packing List: 1xComputer 1xUser Manual