The MGT-1220 12VAC 20VA Class II Power Supply from MG Electronics is a compact transformer that takes in 120VAC, 60Hz, 30W power and outputs 12VAC, 20VA (volt-amperes) with 1666mA of current. It features a standard 2-prong North American type plug for an outlet, and has dual screw terminal outputs to which you connect your wire leads, which in turn plug into any device that uses the designated power rating. The wire can have an open Y-shape connector or simply be a bare wire. Applications include powering alarm systems, gates, thermostats, electric locks, and more.