One Way 25x25mm LED Indicator Alarm Plate With Red, Green, Amber or Blue Display Colour Display can be driven direct. Suitable for 24VAC or 24VDC No built in Buzzer on rear circuit board. No Mute button input Terminals Stainless Steel Front Plate with engraving to customer specificartions. Front Plate suitable for flush mount. Led and circuitboards recessed in backbox.