Trine 5209 Black 24VDC DC Plug In Type Transformer With 120 Volts Primary AC, specially made with a sleek design 2"D x3"H x 2-1/2"W. This transformer has electrical characteristics of 12VDC--20VA-500mA. Caution to reduce the risk of electrical shock, disconnect power to the receptacle before installing or removing the power supply. When removing receptacle cover screw, the cover may fall across plug pins or receptacle may become displaced. And this power supply can be used only with duplex receptacle having center screw and secure this power supply in place by receptacle cover screw.