A rotary switch for installation in the dashboard of a vehicle has a switch housing, an actuation shaft that is arranged rotatably in the switch housing, a knob that is mounted on one end of the actuation shaft, and a ring-shaped faceplate that surrounds the knob and that is detachably fastened to the switch housing. The decoding of the FEC blocks can be deleted by virtue of using opening and closing Temporary Equipment Identifier messages having a minimum hamming distance from all the other TEI messages. The isometric system crystal material transmits a light beam having the predetermined wavelength. The valve assembly is selectively movable between a first position which at least partially blocks suction to the floor suction nozzle and a second position which substantially allows suction to flow through the floor suction nozzle. Therefore, in case one of the locking holes fails to disengage its corresponding engaging pin completely when the locking plate is moved to allow folding operation of the baby bed, the engaging pin still can be disengaged from the locking hole automatically on the course of exerting force on the lower support rods to fold the bed.