JSvsza Stop Watt Energy Saving Device, Balance Pro Power Saver Electricity Saving Device Save Electricity, 90V-250V Power Saving and High Efficiency (4pcs)

Great price, easy to install. Hope it works, will report back later when results are known.After 10 days use, it seems to work, taking readings from my smart meter costs reduced by about 30%. I live in a 4 story house and have one unit on each floor. I cannot understand how this is achieved but am not complaining!

They don't work. Don't save you any money. This is the 3rd time reviews and keeps getting rejected cos I'm telling the truth

Will not plug into English 13Amp plug without 4 adapter that is not present in box not 2 as shown

DYOR. Would be great if you could buy a plug in device to reduce your bills substantially, but sadly it doesn’t exist.

This is a scam item

This and similar devices will not and cannot reduce your energy bill because, to be blunt, it's a complete scam. The box, which contains nothing more than a cheap capacitor, MAY slightly reduce your load current, but that has ABSOLUTELY no effect on your energy consumption. The rate at which you use energy (i.e. power) is expressed mathematically, as P = voltage x current x power factor. Under certain circumstances, this device might improve (increase the value of) your load's power. Unfortunately, inproving or increasing the power factor decreases the load current proportionally. So, if the power factor goes up while the current goes down, there is NO CHANGE TO THE POWER and, therefore, NO CHANGE TO THE ENERGY CONSUMED! So, it is SCIENTIFICALLY IMPOSSIBLE for these devices to reduce your energy consumption.

Potentially dangerous ‘energy-saving boxes’ on Amazon and eBay as energy price crisis bites...The so-called energy-saving devices don’t work as claimed – and failed consumers association lab safety tests twice.Rocio Concha, Which? Director of Policy and Advocacy, said:'These rip-off ‘energy-saving’ devices not only mislead consumers into thinking the products will save them money during the cost of living crisis, but are also a huge safety concern – putting consumers at risk from fires or electric shocks.'After unsafe energy plugs were rightly taken down earlier this year, nearly identical products have quickly returned to the online marketplaces. The current safety measures and reactive approaches to dangerous products taken by the biggest online marketplaces, where many items are only removed having already been available for sale to shoppers, are not fit for purpose,' she added.