Transponder Detector is a device, which is used to receive information from transponding devices on the layout and transmit that information to the loco net system. It has an antenna for radiating a power signal to an identification transponder of an unidentified type and for reading a response signal characteristic from the transponder. It is particularly useful for confirming the presence and type of transponders embedded in the head of keys.

Transponder Key Accessories is a radio transmitter or receiver device that is programmed into cars computer at the factory.