These were removed from a working system but have no power supplies or other ancillary parts, just as pictured, hence the price, somewhere around £800 new so bargain here!

From manufactures site:

The TP-10 is a twisted pair receiver for composite or s-Video (Y/C) signals and unbalanced analog stereo or S/PDIF digital audio signals. The TP-9 transmitter converts the video and audio to a twisted pair signal and the TP-10 converts the twisted pair signal back into video & audio signals.

Any questions, please feel free to ask!