SPOT Sound Masking Speaker reduces the possibility of conversations being overheard by hallway traffic. 2 ft. x 2 ft. self-contained speaker with integral backbox and built-in electronics; designed to mount in hallway outside office door and is ideal for clergy, human resources, counselors, financial offices and solicitors.- Inconspicuous design - looks like an air return.- Built-In Electronics (Power Supply Included).- Reduces intelligibility of oral conversations.- Self-contained speaker includes built-in white noise masking source and amplifier.- Front Panel volume control adjustment for proper operation.- Integral Plenum Ceiling Back-box meets or exceeds ASTM E84 Flame and Smoke Test.- Baked Enamel scratch resistant finish.- Utilizes standard CAT 3, 5 or 6 Cable for operation.- Easy Lay-In ceiling installation in 2x2 or 2x4 ceiling tile grid.- Inconspicuous, blends into ceiling décor.- Installation junction box is provided.- Includes Power Supply.