I was surfing through the vast ocean of NES supplies on eBay and came upon this. It confused me at first, but after some reading, I found a small description.

This came out in 1989. I tested The Dominator and it does work perfectly. It allows you to play with a controller, joystick, Power Pad, paddle or Zapper from a greater distance. It also has a built in joystick which can be used by two players in certain games (so long as you can take turns in the game, like Mario).

I guess it's like the Sattelite, but a controller in and of itself.

Thanks to Cameron Shelton for the above information