Rapid x2 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 cob led technology li polymer battery up to 80 lumen output 180 degree visibility complex circuitry allows safe charge and discharge usb recharge 2 hrs o ring attachment 5 modes constant flashing rapid pulse vibration runtime 130 hrs depending on mode dimensions 744 x 305 x 329 we