It's just a USB.
There is a real anti-5G product called a "5GBioShield", which sells for a whopping $350, despite it being nothing more than a $6 USB stick.
According to the company selling it in the UK, the item is "the result of the most advanced technology currently available for balancing and preventing
the devastating effects caused by non-natural electric waves, particularly (but not limited to) 5G, for all biological life forms."
Described as a USB key, the tiny device allegedly "provides protection for your home and family, thanks to the wearable holographic nano-layer catalyser, which can be worn or placed near to a smartphone or any other electrical, radiation or EMF [electromagnetic field] emitting device."
Apparently plugging it into a USB port expands the field effect from 4m radius to 20m. Experts took a closer look and found apart from a small, round sticker, it virtually identical to a crystal USB key available from various suppliers in China for just $6 apiece. As for the inner working of the 5GBioShield, there was no quantum nano-layer technology visible anywhere, just an LED light, like on the regular 128Mb USB sticks from China. London Trading Standards told the BBC it's a scam.
A good sport