This is a temperature control board for the RetroFlag NESPi-4 Case, SNESPi Case U, SNESPi Case J, MEGAPi Case, NESPi Case/NESPi Case +, and the YIKESHU Black NES Case, this PCB adds the ability to cool down the system during gameplay. Fully compatible with Raspbian, RetroPie, RecalBox, and Batocera.