We've added a couple cool new features to our popular Grateful Red bike tail light. This new version is powered by a lithium polymer rechargeable battery. For added safety, we've integrated a CPSC certified reflector in the lens to keep you visible even when the light isn't powered on. Its dazzling bright 28 LED PB Power Array and three modes make it like a Scarlet Begonia for the back of your bike. Let it shine, let it shine, let it shine!