The XRF-2 bk set is a set that consists of two transmitters and one receiver and has been developed as a wireless transmission system for anti-pinch protection and pedestrian door contact for doors and gates. The transmitter is mounted on the door or gate and the pinch protection (8.2Kohm only or DW with 8.2Kohm in series) is connected to a transmitter. The other transmitter is also mounted on the door or gate, where the wicket door contact is connected. The transmitters are powered by a battery (type: CR2450N). The receiver is connected to a power supply of 12 to 36Vac/dc and the security input of the control.