This is a powerful bicycle mileometer, easy to install, convenient to use, large screen, clear navigation routes, riding without getting lost, more secure. Features: The 2.2 inch LCD screen can comprehensively display cycling data. Via APP, join the riders community, compete with 20 million riders and compete in over 20000 national races. Large capacity battery for long working time. A 2.2 inch fully fitted LCD screen with clear parameters for easy reading. IPX7 waterproof grade, fearless of wind and rain, capable of completing challenges in various harsh environments. USB rechargeable design, you don't need to worry its battery. Specifications: Main color: black Material: plastics Battery: 3.7V, 500mAh Waterproof: IPX7 Screen size: 2.2in Item size: 71 * 48mm / 2.8 * 1.9in Item weight: 42g / 1.5ounce Package size: 130 * 80 * 30mm / 5.1 * 3.1 * 1.2in Package weight: 100g / 3.5ounce Packing List: 1 * Mileometer 1 * USB Cable 1 * Set of Installation Tools 1 * User Manual