[Arran]

Mike;
They also have a similar device that plugs into the scan tool port in your car that is supposed to get you better gas mileage, except that the LED blinks to make it look like it's doing something. Some of the older power "saving" devices had a capacitor inside, usually potted, that could actually work with a limited number of things, in theory, but they have all but given up the pretense of having anything but an outlet, and an LED. I think that the idea was there was some savings in phase correction, I'm guessing with inductive loads, but you would understand that more then I would, it would do bugger all with a resistive load.
Regards
Arran