Enhance your cycling safety with the RL 510 Rear USB LED Bike Light, delivering 3 lumens of brightness and visibility from an impressive 220. Designed for continuous use, it lasts up to 8 hours and is certified for road use, ensuring you stay seen during your rides. Rechargeable via USB, it features an elastic band for easy attachment to your seat tube and a clip for your helmet or other gear. With an IPX4 rating, this light withstands spray and heavy rain, making it a reliable companion in all weather conditions.