No inputs at all. The only thing it has is a regular headphone jack (which doubles as its antenna). The large plug on the right of the receiver is the output that goes to the watch for video.
I thought of something, What if I clipped the end off a headphones and strip the wires and then connect something like this:

to those striped wires? Does that make any sense. I dont know how the headphones provide the video signal so not sure if it will work.