The Bogen SM1EZ and SM4T Easy Install Speakers are surface-mount speakers, designed to typically install in less than a minute. Installation is a simple, three-step process that does not require tools. First, two specially-designed studs pierce the ceiling tile. Second, two custom-designed wing nuts secure the speaker to the ceiling. Third, standard wire nuts make the electrical connection directly to the color-coded studs. Both the SM1EZ and SM4T are lightweight, durable speakers with a low-profile contemporary design, making them versatile enough to be installed in just about any installation with standard ceiling tiles. The SM1EZ is a 1-watt single-tap speaker. The SM4T is a 4-watt multi-tap speaker with a rotary switch that eliminates transformer tap wires. Both models have an exterior volume control for easy balancing that is easily accessible, but doesn t attract tampering. Installs in less than a minute Compatible with both 70V and 25V systems High intelligibility and efficiency 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 electrical connection easier (no external wires) High-quality, wire-wound volume control on outside of speaker for easy access 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 SM1EZ has a single, 1-watt tap SM4T has switch-selectable multiple taps for controlling output level (taps 4, 2, 1, 1/2, 1/4 watts) 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 Tile Bridge available (Model SMTB, sold separately) All necessary mounting hardware included Complies with NFPA National Code 160b and UL-2043 (Report available)