Cyber-security experts say the £339 5GBioShield appears to no more than a basic USB drive.
“We consider it to be a scam,” Stephen Knight, operations director for London Trading Standards told the BBC.
He said his team is working with the City of London Police’s Action Fraud squad.
They are seeking a court order to take down the company’s website.
“People who are vulnerable need protection from this kind of unscrupulous trading,” he added.
The intervention follows an examination of the device, which was first reported by the BBC.
The vendor – BioShield Distribution – had previously said the device was backed by “research”, but has not responded to the latest development.
The 5G Bioshield was recommended by Toby Hall, member of the Glastonbury Town Council 5G Advisory Committee. Someone has been in touch to say they’ve made a formal complaint to the Council https://t.co/hdzaWgjExI pic.twitter.com/dnuVvpI3zm
— Rory Cellan-Jones (@ruskin147) May 28, 2020
"There is no measurable effect in terms of protection from the 5GBioShield USB key.
There are measurements which confirm 100% efficiency of our 5GBioShield Key in protection from ANY kind of radiation."
— Shah Selbe (@shahselbe) May 22, 2020
"Through a process of quantum oscillation, the 5GBioShield USB key balances and re-harmonises the disturbing frequencies arising from the electric fog induced by devices, such as laptops, cordless phones, wi-fi, tablets, et cetera,"
— Scott Helme (@Scott_Helme) May 28, 2020
So @Yekki_1 and I bought and dismantled a £300 5G BioShield, as referenced in report by Glastonbury Town Council. "quantum holographic catalyzer technology" or £5 128MB (yes, meg) USB key with a sticker on it? You decide:https://t.co/JNezD8WqNV pic.twitter.com/HzW2np04VZ
— Ken Munro (@TheKenMunroShow) May 28, 2020