1 Volume & 4 Switch equipped Wall Mount Control panel for MTX/MRX Series and MA/PA series. Easy connection by CAT5 carrying RS485 + power. Maximum 8 DCPs can be connected to 1 MTX/MRX Series. 1 DCP1V4S can be connected to 1 MA2030a/MA2030. Maximum 2 DCPs can be connected to 1 MA2120 or PA2120.