The Lux Rear Light will keep you safe with its ultra-bright beam and simple design. The light charges from a USB, is water-resistant and has three different modes that will adapt to the specific light conditions of your environment. Designed to be used in tandem with a front light like our Lux Front Light , this red back light throws out 65LM of illumination for enhanced visibility. The lithium battery is fully-rechargeable and the light is supplied with a universal bracket, rubber band and saddle rail bracket.