With double the output of the rapid x the rapid x2 somehow manages to keep the slim form now synonymous with the x range by beefing up the led and batterycateye have squeezed a massive 100 lumen output from this diminutive light cob led technology li polymer battery upto 100 lumen output 360 degree visibility complex circuitry allows safe charge and discharge usb recharge 2 hrs o ring attachment battery auto save auto flash 6 modes constant flashing rapid vibration high