High-quality 4-way switch with an exceptional principle. The central connection is located on a movable rail and is permanently connected to another connection. Switching is done by pulling out the gear knob (the rail with the two connections is pulled out of the socket). The knob can then be turned to the desired position. Finally the knob is pushed in again and the rail with the contacts is pushed into the socket and the connected plug have contact. Compared to the connections that are not switched, the blocking is 75 dB!