Long-life rear lamp on the seat post The 15 lumen LED bike seat post clamp light is a must-have for any bike. Long lifetime, up to 30 hours of work on a single charge! Four lighting modes: switching between modes is done with one button, you can quickly switch modes according to your needs: slow flashing, fast flashing, steady flashing, and steady light. More safety: High-brightness energy-saving LED lights have a wide range of illumination, making them visible on the road whether you are driving during the day or at night Battery Powered: Micro-USB charging cable included, can be charged with any device. The lamp can be charged in about 2 hours, battery life in different lighting modes varies around 10 hours of lighting operation. Easy installation: the bicycle light is installed with a rubber buckle, the lighting mount is universal! Fits in any preferred place on the bike. Easy to assemble and disassemble!