About this projectAdvanced Design: USB rechargeable bicycle lights, each light has a built-in 650mAh rechargeable lithium battery.F Our Light Mode Options: One-touch switches for the headlamps and taillamps provide f Our different lighting modes depending on your preference. Including full brightness, half brightness, fast flashing and slow flashing.EASY TO INSTALL: Silicone mounting straps are designed with two openings to fit snugly on many sizes of seatposts, handlebars, seatposts, backpacks, helmets and stretchers to keep lights safe and secure. They can be easily loosened and fastened without any tools.MULTI-FUNCTIONAL: This bike light set is versatile enough for cycling, hiking, camping or any outdoor activity, it can be used as an emergency flashlight. This is great for cycling at night or where visibility and safety are a concern. So, start your next adventure with us.