The shuttle accessory pos01 is compatible with the shuttle all in one pc x50v4 it will add four serial com one parallel lpt port and one rj11 port for a cash drawer to the back panel of the pc interfacesports connector 2x serial port sub d 9 pins male bull 1x parallel port sub d 25 pins female bull 1x digital io for cash drawer dio rj11 connector 12v or 24v rj 45 ports 2x serial port rj45 connector physical form factor expansion card in the box printed circuit