The SHR-12 L4 radio receiver evaluates every radio signal from compatible transmitters in the SH-12 radio series and can switch one or more of the 4 potential-free relay contacts on and/or off. To implement a command from a transmitter, it must be taught in once. Teaching in a transmitter is done easily via a button. Depending on your preference, up to 60 transmitters can be learned with all buttons or individual transmitter buttons. A special highlight of the SH-12 radio series is the feedback from the receiver. This allows you to see on the transmitter whether the radio communication was successful and provides information about the quality of the radio link. This feedback can also be disabled for specific applications. In the SHR-12 L4, transmitter buttons or transmission commands are permanently assigned to an output or relay contact. Both normally closed and normally open contacts are available for connection. LEDs indicate the function and transmission behavior and show the status of the power supply. Using jumpers, the relay function for each output can be set individually. In button operation, the input and output behave identically. The output is active only as long as ON is transmitted. In toggle mode, one command keeps the output permanently active. The same command then switches the output back to permanently inactive, and so on. The SHR-12 L4 is delivered ready for connection with an IP54 housing and built-in wire antenna. By attaching an external or remote antenna, the receiver's range can be further increased. With our service option for a BNC connection, we install a BNC connection from the factory while adhering to the housing protection class. If installation is to be done after delivery, the BNC connection kit for self-installation can also be used.