lights on monitor

A friend of mine told me he had been approached by someone who proposed to put "these little pads by his doors that will tell him if he had left any lights on in the house". Any idea what there is that would be easily installed and would let you know whether a light was left on upstairs or in the basement? TIA
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My guess is that, whatever this gizmo is, it costs considerably more to purchase and install it, than it costs in utility bills to leave a few lights burning now and then.
-- Regards, Doug Miller (alphageek at milmac dot com)
Nobody ever left footprints in the sands of time by sitting on his butt. And who wants to leave buttprints in the sands of time?
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