The Bogen NQ-SMS1810-VF sound masking loudspeaker assembly consists of an 8” O.D., dual cone loudspeaker with a 10 oz. magnet, and 25V/70V, five position 4W max. rotary tap selector. 2 multi-position hangers included for upward, downward, and side firing installations. Installation is made easy via the included 78" (2m) suspension chain system which allows quick mounting and height adjustment. An integral wire strain relief is located on the top of the enclosure to facilitate secure speaker cable termination.