Monorail 2-Circuit 2x150 watt, 12 volt, surface mount magnetic transformer converts two 120 volt input to two low-voltage 12 volt output. The decorative surface mount transformer mounts to a standard 4 inch square electrical box with round plaster ring or octagon electrical box (not included). Rail attaches to one or both side-feed contacts using push-in conductive connectors (included). Standard surface mount transformer powers the rail 1 inch from ceiling. Use with 1 inch standoff's. Maximum 2x150 watt loads. Is LED compatible with 12 volt AC LED's. Finish available in satin nickel, polished nickel, or antique bronze. ETL listed.