This is for two ESU Lokpilot 21 pin MTC standard DCC decoders. Serial numbers in the pics. Purchased new by me a few years back and simply never installed. Tested both for this listing, one can be seen working in the video and the other in a pic with all its outputs on and motor spinning. Both have been updated with the latest firmware so as good as new. No cvs have been changed so these are as if from factory. Any questions just ask.