The garage door opener (GDO) is a transmitter operating between 288 and 399 Mhz. The power and range of the transmitter is limited to comply with laws governing the generation of radio frequency interference (RFI). The transmitter is programmed by the user to accept the signal generated by the user's transmitter(s), refer to Garage Door Opener Programming - Universal . The three center buttons on the DIC may be programmed for individual transmitter/receiver combinations to control up to three garage door openers, security gates and lighting systems. Each button represents a transmitter code section of the transmitter, operates separately from any other button and may be considered a separate transmitter.

Operation consists of simply pressing a button to activate the corresponding transmitter.