Fraud alert. Smarthome please remove this fraudulent item from your offering. Do not even think of buying this. The return policy is also the proof. This is a black box without any explanation given how does it do it. There were plenty of such devices before. They claim to do phase shifting power factor correcting devices. You do not have any device in the house that it would properly work on to make any difference, assuming that it is not a fraud. Power factor correcting devices are used in huge indusrial plants on huge electric motors and installations on three-phase power supply. The system wide savings of 0.1% might make sense, at home they do not matter. But 100% of plug-in devices offerred to consumers for this purpose are fraud. If you do not know what reactive, real and apparent power is - do not buy this thing. It is a fraudulent as it gets. It is even worst than those ultrasonic squirril and mosquito repelants. If you have time and understanding read this: http://sound.westhost.com/lamps/power-savers.html