The Bogen 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.