R.O.B. [ Robotic Operating Buddy ], released in Japan as the Family Computer Robot, and is an accessory for the Nintendo Entertainment System (NES). It was launched in July 1985 in Japan, and October 1985 in North America. R.O.B. receives commands via optical flashes in the screen. Once the screen lights up, R.O.B. is ready to receive six commands. Just like the NES Zapper, R.O.B. only functions correctly when coupled with a television. Both Gyromite and Stack-Up include a test feature, sending an optical flash that should make R.O.B.'s LED light up.
Source: Internet, My Collection - Updated 06-14-2018
