Maximum Visibility - This rear bike light uses OptiCube lens technology to deliver 150 lumens of ultra-bright illumination, making it visible from up to 1 km away. Stay seen and safe with this powerful bike rear light, even on the darkest roads. Extended Runtime - Get up to 70 hours of illumination in flash mode with this USB rechargeable rear bike light. Designed for reliability, the long-lasting battery ensures your rear cycle light is always ready for your next ride. Multiple Modes - Choose from four distinct settings including High, Low, Flashing and Group Ride mode to match your visibility needs. Whether using this rear light for cycling on city streets or group rides, you’ll have the right lighting for any situation. Secure Mounting - The sturdy FlexTight bracket system keeps this rear bike light firmly fixed to your seat post, while the quick-release mechanism allows for easy attachment and removal. This rear bicycle light fits securely without tools. Compact Design - Lightweight yet durable, this bike light rear won’t weigh you down. Built for all-weather performance, this bicycle rear light withstands rain, road debris, and daily cycling conditions for year-round safety.