This is a used NES Nintendo Satellite Remote Control. It has been tested and is guaranteed to work!
With select supporting games, the Satellite allows up to four players to play the NES, potentially simultaneously. Additionally, it acts as a wireless range extender adaptor for all wired controllers, with the use of portable, battery-powered, infrared technology. While a normal controller has a range of 7.6 feet, the NES Satellite expands the usable range to 15 feet.[1][2] A small infrared receiver plugs into the two controller ports on the front of the NES. The main Satellite unit is powered by six C-cell batteries and must have a line of sight to the receiver. The unit has four controller ports which accommodate any type of wired NES controllers. The unit provides “Turbo” selectors for both the A and B buttons.