Louroe Audio Monitoring TLSP-PB-12V 3 inch built-in speaker and electret condenser microphone mounted to an 11 gauge stainless face plate and contains a flush mount push button. When pressed, the alarming base station is activated, identifying the zone location. Designed for correctional facilities or public areas where vandalism is a concern. Security hardware included. IMPORTANT: Use only with Louroe Push Button Activated base stations (Models AP-4CS, AP-8CS, and AP-12CS). Dimensions: Flush mount face plate: 7 inch W x 7 inch H. Surface mount face plate: 6 1/4 inch W x 6 1/4 inch H. Back box (included): 6 inch W x 6 inch H x 4 inch D