The ControlBlock makes it very easy to connect arcade controllers or console controllers, for example, for (S)NES, Atari, Genesis/Megadrive, or Sega Master System consoles. Up to two players are supported by a single ControlBlock. Stacked upon each other, up to four players are supported. The open-source driver for the ControlBlock is easy to install and can be configured to your liking.
The power switch functionality allows to turn on and off the power to the Raspberry Pi with a toggle switch without the risk of data loss. You can also connect a status LED for indicating the power status of the Raspberry Pi.