When I tested this it seemed like it might not even have a capacitor in it as the magic "mystery component". But it does. With extra mystical wiring.

Probably a nice night light, but don't use force to get its bizarre plug into a standard socket.

These units rely on deceptive marketing and science based loosely on power factor correction, which can't really be applied in this way to your home.

To be quite blunt it's conmen blinding the average Joe with science.

If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:
http://www.bigclive.com/coffee.htm
This also keeps the channel independent of YouTube's advertising algorithms allowing it to be a bit more dangerous and naughty.