USB RECHARGEABLE BATTERY This product contains a rechargeable lithium battery (400 mA) that can be charged using any device with a USB port (PC / Power Bank / Charger /). 3 hours of charging and 12 hours of use in low power mode. 4 LIGHTING MODES Front and rear lights support 4 lighting modes: constant full/half brightness -constant brightness/fast flashing/strobe. It offers 350 ultra-bright lumens and 12 hours of use in low-light mode. Simply press and hold the lens position to switch modes as needed. The front and rear lights provide 360-degree safety, illuminating the road ahead of the bike WATERPROOF AND LIGHTWEIGHT Fully enclosed design protects the bike light set from rain, even with fully covered USB port for easy use in all weather conditions. Lightweight but sturdy shell ensures stable performance, important for riding on harsh terrain. SAFE AND EASY TO INSTALL Silicone design keeps the bike light unit tight enough to be difficult to drive even on uneven surfaces. Whether walking the dog, cycling, skateboarding, hiking or motorcycling, the ultra bright red light safety light will keep you safe.