Integrated Digitrax DCC transponder. Can function only DCC decoder with ransponding. Can function only DCC decoder without transponding. Can be added to a unit that already has a non-transponding DCC decoder.
I use these to control lights in passenger cars. Attached to a string of leds and I am able to turn the lights on and off. No need to have the lights on when the cars are in a siding.