volume control with relay FVC-C6
* PA (Public address) system use volume control with 24V relay.
* Background music system with voice alarm use attenuator with 24V relay.
* The volume controller is used to adjust the loudspeaker output in the room.
* Background music system with voice alarm use attenuator with 24V relay.
* The volume controller is used to adjust the loudspeaker output in the room.