This bicycle speed meter Features a clear 3.7-inch large screen with a backlight function, ensuring visibility even at night. It's capable of measuring mileage, average speed, and maximum speed of cycling, among other powerful functions. Easy to install, this product is perfect for outdoor cycling and keeping track of your ride data. Features: Clear view of your cycling data on a large 3.7in screen, even in the dark, with the backlight feature. Measure your mileage, average speed, and maximum speed of cycling, etc, with this powerful bicycle speed meter. Installing without spending lots of time and effort. With its daily waterproof design, you don't have to worry about getting caught in the rain. The extended bracket makes viewing the screen even more convenient. Don't worry about losing your data if the power cuts out, this product has the power-off memory function. View your cycling data on your mobilephone with the compatible app. The 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. Specifications: Main color: black Material: ABS Battery: 3.7V, 1000mAh Sensor battery: 1 * CR2032 Screen size: 3.7in Item size: 95 * 60 * 18mm / 3.7 * 2.4 * 0.7in Package size: 178 * 105 * 52mm / 7.0 * 4.1 * 2.0in Package weight: 208g / 7.3ounce Packing List: 1 * Mileometer 1 * USB Cable 1 * Set of Installation Tools