... 2 / 3 / 4 sec. optional2) Straight arm with rubber bar, Max.length following: 6m for 4 sec. & w/ ... ),orange, white, red and blue6) Optional boom arm direction as leftward or rightward Simple structure, easy ... to be hit by arm.Closing Priority While arm moving up, the arm will immediately go down ... covers all models with different boom arm shape(straight/crank/fence), boom arm length(Max.6m) and opening / ...