Flush or surface mounted in standard single-gang outlet boxes Heavy-duty long-life switches Color-coded connecting leads Brushed aluminum faceplate Mounting screws included Designed for use with the PI35A, SI35A and Multi-Graphic Series 115B/2223/2233 systems SCR holding circuits actuate the annunciator signal and LEDs in Bogen's SBA-Series room selector panels Provide momentary press-to-call