Solar & USB Rechargeable: This bicycle light Built-in 2000 mAh high capacity rechargeable lithium battery, can use charge treasure, power socket, computer charge, and also can be charged via solar energy(inclub USB cord).It can be used to power other USB device, no need to worry the power running out. 4 Modes LED Bike Lamp: Max 350 lumens (Effective distance 600ft) front bike light ,Ultra bright ,4 Mode and Light perception control mode(light automatically switch on/off), Click button to change mode. Waterproof , rainproof, No worry about rain. Super warning speaker: 5 mode sounds speaker and 120 dB. Long press the switch for 5 seconds to change the modes, loosen your finger when hearing the goal sound, that is your successful set up. you don't need to shout to remind other person, more convenient on the road.Line control horn can be removed. Emergency flashlight: This bicycle headlight can be used as emergency flashlights in cars, basements, attics and emergency kits. Use it when running, jogging, trekking, camping, walking a dog, cycling, changing tires, nighttime family/kids activities, power outages, etc. Easy and Quick Installation: Dual switch design, easy to install and detached the bike light and bike horn, mounts tightly, no tools required. The dirt bike light set fits on every part of the bike handlebar in diameter 23mm-33mm.