1USB Fast Charging: USB rechargeable bike rear light has built in 350mAh rechargeable lithium battery. A variety of charging options are available.2Waterproof Light: The bicycle tail lamp is waterproof and not afraid of wind and rain. The bike taillight is normal in heavy rain.3Durable ABS Material: With ABS housing, the bike tail light is more durable and strong. It will not crack if used for a long time.4Four Light Mode Options: Taillight features four different lighting modes depending on your preference. Include full brightness, half brightness, single flashing and strong flashing.5Easy to Install: Bike rear light is easy to install and can be used directly after installation. This set of this light kit is suitable for most bicycles.1 x Bike Light 1 x Cable 1 x Strap