Allows you to Either Connect a Microphone or External Player to the Selected Channel. Direct Access to Volume Controls on the Controller. Controller Powered up by the Amplifier via RJ45Dimensions: 80 x 80 x 50mm Weight: 135g. Wall-mounted controller for PREZONE444(ZONE444) or ZONEAMP412(ZAMP412). This allows you to either connect a microphone or external player to the selected channel. This wall panel gives direct access to volume controls. Connected and powered via a RJ45 cable- which connects back to the mixer.. wall controller-amplifier controller