The radio receiver SHR-12 L4 evaluates each radio signal of the matching transmitter, the radio series SH-12 and can have one or more of the 4 potential-free change-over contacts on and/or off.In order to implement the command to a transmitter must be programd once before. The programming of a transmitter is easy with the push of a button. If you wish, up to 60 stations with all buttons or individual transmitter button must be programd.The SHR-12 L4 are channel buttons or the transmission commands is hard a output or relay contact. For connection, both normally open and normally closed contacts. Leds provide information about the function and the transmission behavior and indicate the status of the power supply.With the help of the jumpers, the relay function for each output can be set individually.Push-button operation: transmitter input and receiver output behave the same. Only as long as is sent, the output is active on.Toggle Mode: a command switches the output permanently active.