The cateye rapid x2 usb rechargeable rear light new and improved for this season the rapid x2 keeps the same slim profile as the rapid x now synonymous with the rapid family but now with an improved 80 lumen output cateye rapid x2 usb rechargeable rear light bull ultra bright strip led technology bull li polymer battery technology up to 50 lumen output bull complex circuitry for safe charge and discharge bull usb recharge 2 hrs bull o ring attachment bull 6 mode