The bike light doesn't even need to be plugged in to charge or have its battery replaced because it runs on power generated by natural energy from the sun. Meanwhile, special designed with an intelligent sensor, it will turn on automatically in low brightness and vibration mode. Absolutely a wonderful bike accessories for cycling enthusiasts. Features: Converts the solar energy to electric energy directly, convenient and energy saving. Great waterproof performance, safe to use in rain and winter weather. Built-in high precision sensor, automatic lighting in darkness and vibration mode. 7 hours normal working after full charge. Offers super brightness but not dazzling. Universal adjustable mounting bracket for most bikes, scooters. Perfects for cycling, travel, camping, mountaineering and other outdoor activities. Specifications: Material: ABS + PC Color: Black Waterproof: IPX6 Battery Capacity: 300mAh Endurance: 7 hours Product Size: 106 * 38 * 40 mm / 4.2 * 1.5 * 1.6 in Product Weight: 80 g / 2.8 oz Packing Size: 163 * 70 * 45 mm / 6.4 * 2.8 * 1.8 in Packing Weight: 140 g / 4.9 oz Package List: 1 * Bike Light 1 * Mounting Bracket