It does not; it's a sticker on an USB stick

So I wonder about legality of it - devices that interfere with wireless communications are illegal....so what about a device that says that it does, but in fact it does not? I guess the description is crafted in such a way that it doesn't actually say it interferes, just that it "harmonizes" the fields, whatever that means.

It may potentially be illegal, given that "deliberate interference" is a criminal offence contrary to section 68 of the Wireless Telegraphy Act 2006. [0]

~~~

(1) A person commits an offence if he uses apparatus for the purpose of interfering with wireless telegraphy.

(2) This section applies—

(a) whether or not the apparatus in question is wireless telegraphy apparatus;

...

~~~

Obviously, the "purpose" of the person using the anti-5G USB stick would need to be established. Given the law doesn't mention anything about having any effect on wireless telegraphy, presumably as long as mens rea is established the offence is made out.

There are also other potential offences around consumer misselling, false advertising, etc.

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[0] http://www.legislation.gov.uk/ukpga/2006/36/part/3/crosshead...

I assume there's no law in the UK against "harmonising all harmful frequencies into life affirming frequencies" since that's not a real thing.

Laws against false advertising on the other hand...

It's does absorb the field and change its shape.

Not very extensively, but such is life.