I wouldn't buy it for several reasons besides those mentioned by other members above, for some reason the seller shows Coinomi desktop software, doesn't mention details of the encryption used... just a generic pen-drive like any other.

Never buy products like this, the chances of it being a blatant scam are 99% (very high risk) or someone trying to make a quick buck eBay, even so, would you trust your coins (or your life savings) to a total stranger with a mediocre description?

Buy a Trezor, Bitbox02, Coldcard or Passport (these two are fully air-gapped) and you will at least be following the standard security models of the market.

As mentioned, you can make a bootable pen-drive with TailsOS and electrum built in and have security comparable to a hardware wallet (if you use it offline on an air-gapped device), there are several tutorials out there.