Consumer champions Which? have issued a warning over 'energy saving boxes' which have been for sale online on sites including eBay and Amazon. Sellers of the devices claim they can cut your energy bills, but Which? says tests show they do not work and could be dangerous.
Amazon and eBay have withdrawn a number of the products from sale.
The devices plug into a mains socket and sellers say they work by 'smoothing’ household voltage and ‘optimising’ the performance of appliances. But Which? says its lab found no evidence that they work and found the boxes may be dangerous as they do not comply with British electrical safety standards.
