Kinetic x2 rear light a new revolution in lighting bringing together the brightness and 180 degree visibility of the rapid range the new kinetic light adds an additional dimension with a built in sensor which detects the movement of the rider the beam will automatically change from flash to constant when stopping 3 modes constant flashing rapid up to 50 lumen output fixed beam from pulse when stopping cob led technology li polymer battery 180 degree visibility complex circuitry allows s