Stickers supposed to protect users against mobile-phone radiation have no effect, scientists have found.
Energydots says they “counteract the harmful energy emitted by wireless and electronic equipment” to aid sleep, cure headaches and give a clearer mind.
But University of Surrey tests for BBC News found no evidence of any effect.
The Devon-based company told BBC News the stickers were programmed with “scalar energy”, which the scientists’ equipment would be unable to detect.
Energydots markets a range of stickers, including the SmartDot, the SleepDot and even the PetDot.
BBC News bought five SmartDots – a special offer for £55 – and sent them to the university’s 6th Generation Innovation Centre.
Researchers tested 4G mobile phones and wi-fi access points with and without the stickers applied to them.
And a spokesman for the lab said: “We could not find any evidence that these products had any effect on frequency or power when used as instructed.”
An Energydots spokeswoman told BBC News: “We state clearly that our products harmonise the fields.
“And the way to test this is to assess via biological testing.”