The DSC HS40WPSA is a 18VDC 2.2A Plug-in Transformer. It's compatible with the PG8WLSHW8, PG9WLSHW8, PG9HRDW8, and the IQ PRO. The input rating is a standard 120VAC, 60Hz at 1.2A of current draw. The wire run limit for the transformer is 13'' when 18-gauge cabling is used. Do not exceed the listing wire specifications. Wiring for the unit is not included.