This is a product that integrates the functions of codewatch, bicycle headlight and horn. It is compact and easy to install, bringing more convenience and safety to cycling. Features: Cut-OFF line light, anti-glare, non-dazzling, non-disturbing, safer riding. The horn/headlight dual-line control button is designed for convenient operation and safer riding. High decibel electronic horn, one-button switching of five horn sounds. Large and clear LCD screen for easy reading. Total mileage/total driving time/clock/stopwatch/calorie switch at will. Automatically enter sleep mode without use for 3 minutes, and automatically wake up after sensing vibrations. USB recharging design, recharging at any time, more convenient. Daily waterproof design, no fear of sudden rainy days. Specifications: Color: black, blue, red, green (optional) Lumen: 450lm Battery, 3.7V, 2000mAh Material: ABS Item size: 119 * 58 * 90mm / 4.7 * 2.3 * 3.5in Package size: 130 * 94 * 82mm / 3.7 * 3.2in Package weight: 311g / 11.0ounce Packing List: 1 * USB Cable 1 * Tie 1 * Button Cable 1 * Speed Meter 1 * Button Fixing Belt 2 * Antislip Gasket 1 * Sensor 1 * Magnet 2 * Bracket