Peripherals
In Japan, Hori released a special Super Game Boy controller called the SGB Commander. The controller, aside from the 4 Game Boy buttons (A, B, Start and Select), also had 4 Super Game Boy specific buttons which could enable the user to mute the sound, increase or reduce the speed of the game, change the colors and modify the display window. An additional switch is provided to alternate between Super Game Boy mode and Super Famicom Mode.
Read more about this topic: Super Game Boy