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: blackMaterial: plasticsBattery: 3.7V, 500mAhWaterproof: IPX7Screen size: 2.2inItem size: 71 * 48mm / 2.8 * 1.9inItem weight: 42g / 1.5ouncePackage size: 130 * 80 * 30mm / 5.1 * 3.1 * 1.2inPackage weight: 100g / 3.5ouncePacking List:1 * Mileometer1 * USB Cable1 * Set of Installation Tools1 * User Manual