Features1Clear view of your Cycle data on a large 3.7in screen, even in the dark, with the backlight feature. 2Measure your mileage, average speed, and maximum speed of Cycle, etc, with this powerful bike speed meter. 3Installing without spending lots of time and effort. 4With its daily rainproof design, you don't have to worry about getting caught in the rain. 5The extended bracket makes viewing the screen even more convenient. 6Don't worry about losing your data if the power cuts out, this product has the power off memory function. 7View your Cycle data on your mobilephone with the compatible app. 8The USB rechargeable design and large capacity battery ensure long working times, and the low battery warning will remind you when it's time to recharge.SpecificationSpecifications:Main color: blackMaterial: ABSBattery: 3.7V, 1000mAhSensor battery: 1 * CR2032Screen size: 3.7inItem size: 95 * 60 * 18mm / 3.7 * 2.4 * 0.7inPackage List1 * Mileometer 1 * USB Cable 1 * Set of Installation Tools