Superheterodyne single conversion receiver with 2x24VA relays.
Programming of transmitters can be performed either directly on the receiver using the 2 pushbuttons or externally using the buttons on the transmitter.
The receiver's general parameters (relay, time, etc.) can only be performed using the receiver's 2 pushbuttons.
All programming steps are shown on the backlit LCD display. The internal data can be saved / restored to / from an external memory.