The back of my Rogue is printed: "24 VAC, 50/60 Hz, 6 W" I do also have toe original power supply WallWart, and it says "AC/AC adaptor, 24 V, 500 mA max.". IMHO 6W @ 24 V transforms into 250 mA. So i think this will be the minimum rating. -Michael Buchstaller