Rapid x rechargeable rear light 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 lum