The ZM-9002 is a remote control switch/volume panel used with the 9000 series amplifiers. It adds 4 amplifier control inputs and 1 remote volume control, and can be mounted in a standard 1-gang electrical box in the wall.
4 buttons to activate preset selection or volume up/down
Remote control unit for fully digital mixer M-9000. Four programmable buttons for retrieving by default, volume settings, or the choice of signal sources. Volume control for inputs or outputs. Wiring with single conductor shielded cable. Simple flush-mounted installation.