USB Rechargeable Bike Light Set - Great for Commuters - CREE XP-E LED, Lithium Battery, Bonus Tail Light, well designed beam pattern, 300 Lumens, 5 Second no-tool installation, Vivo-Bike Illuminati SHAPED BEAM - Light beam designed for biking, not just a round flashlight beam. USB CHARGING - Charge the Li-Poly battery using all the USB chargers you already have for phones and devices, or just a computer. You'll be able to charge up nearly anywhere! (wall outlet adapter not included) FAST MOUNT - No tools, no loose straps or parts to drop, switch from bike to bike in seconds. Adjustable aim. COMPACT & BRIGHT - It's tiny and lightweight but it's BRIGHT. 300 lumens. Bright enough to be seen and to really see the path ahead. VERSATILE - Weather proof, compact, side-visibility lights for extra safety and protection.