The Atlas Sound AT10-PA Plate-Mounted 10W Attenuator provides a priority paging feature that by-passes the attenuator dial setting to provide full program level to your loudspeakers. The SPDT relay is operated with 24 VDC at 10mA. It includes a protective relay cover to insure performance. The terminations to the relay and attenuator are made via a removable terminal block. (All other specifications except for dimensions are the same as selected AT models.