The Alpha Communications® SS106 Class 2 transformers offer a compact, easy-to-install, low-voltage AC power surce for use with various Alpha Communications® intercom systems and related products. The SS106 is U.L.® Listed, and will safely take itself off-line when overheated. The SS106 transformers are constructed for easy installation in a standard 1/2" knockout, or for surface mount installations, and may be used in plastic or metal boxes. Primary wire connections are made using the pre-stripped pigtails and ground wire; secondary connections are made using screw terminals.