Installs in less than a minute. Self-contained 1W amplifier. High intelligibility and sensitivity. Wide-range frequency response. Direct and reflected sound paths create wide dispersion angle. Lightweight and durable plastic shell with an off-white, paintable finish. Simple, three-step installation process. No tool(s) installation. Color-coded mounting studs identify polarity to make the power and audio connections easier (no external wires). Front-mounted volume control for easy access. Transformer-isolated, balanced audio input. Can be installed in any drop ceiling with standard ceiling tiles. Surface-mounting design eliminates need to cut ceiling tile, no mess installation. Contemporary design blends/matches any decor. O-ring seal holds speaker tight to ceiling surface, eliminating whistling and ensures smoother sound without peaks. Textured studs easily pierce ceiling tile and secure wire nut connections. Wide-bottom, easy-to-handle mounting wing nuts provide secure speaker mounting. All necessary mounting hardware included. Tile Bridge available for weight distribution (model SMTB, sold separately). Complies with NFPA National Code 160b and UL-2043 (Report available).