Cateye: The revised Rapid X is now even brighter! Now pumping out an impressive 50 lumen of 180 degree visible light! The Rapid X may look like a normal Cateye light but this neat compact rear light offers a level of light intensity like no other. Visible from 180 degrees and using a neat band fitting system it can be placed inseveral different positions on the bike, from seat post to seat stays.• Ultra bright strip LED technology• Li-Polymer battery technology up to 50 lumen output• Complex circuitry for safe charge and discharge• USB recharge (2 hrs)• O-Ring attachment• 6 modes: High / Low / Flashing / Rapid / Pulse / Vibration• Runtime: 1 - 30 hours depending on mode• Dimensions: W 22.5 x H 27.2 x L 73.2mm