RELIABLE USB BIKE LIGHT - Incorporate two premium quality LED lights, which has a cool white 550 lumen wide beam. Make sure you stay visible on the road and cycle safely at night. The upgraded circuit board makes the more stable light output, which guarantees your safety while driving. MORE THAN A BICYCLE LAMP - Ergonomic design of the adjustable cell phone holder, you can adjust the appropriate angle to place the phone. Come with 120 decibel horn with 5 kinds of sounds, easy to use. MORE POWERFUL BATTERY - Equipped with 4000mAh lithium battery, the battery life is better than other powerful bike light at the same price, very cost effective. It can also be used as a backup power battery, thus avoiding the embarrassing situation of cell phone power failure, it is a powerful bicycle light essential for outdoor travel. EASY TO INSTALL - You can quickly install the bike light without tools, and it supports quick removal of lights from the light stand for charging. Thanks to the high quality material of the bracket and the design of the clip, it can also prevent the lights from falling off, being damaged or rotating while driving. Driving safety comes first. USB RECHARGEABLE AND WATERPROOF - It adopts USB port for charging, and it is equipped with automatic shutdown function after full charge, which prolongs battery life. The IP65 waterproof rating assures you cyclists in bad weather. Loud Ringtone This bicycle light is equipped with a horn. It can output clear ringtone up to 130 DB with 5 sound modes, which can be heard in loud traffic like security warning bell. Attract the attention of pedestrians and achieve safer driving. Rechargeable USB & External Battery This bicycle front light is equipped with a 4000mAh rechargeable lithium battery, which has an operating time of 4 to 12 hours. The bike light can be charged by your computer or any device with a USB port, and you can also use it to charge your phones when you are cycling. IPX-6 Water Resistant The bike light is fully sealed and waterproof. Whenever you travel outdoors, you don't have to worry about incorporating rainwater into rainy days.