These things are not even as sophisticated as a Nola device (not that they work in resi applications either). These cheap Chinese boxes are flooding the market with wild claims, but are nothing more than a capacitor. They do NOTHING to reduce the power bill. They appear to reduce current, but only because they improve power factor. In China, maybe they charge all users for poor power factor, but in the US and most other Western industrialized nations, they do not. So even though the amps will go down, the kW, and thereby the kWh as read by the revenue meter, will NOT change. Most homeowners have no clue however, so they buy it and think that it works. By the time they figure out that it doesn't, the snake-oil seller they bought it from is long gone, and the manufacturer is untouchable in China.
