Just to shed a little light on this, the airport security didn't explain very much and they didn't speak much English. The guy told me to speak to his "manager" who basically told me I can't bring that on a plane. It was also a SeedOr, not SeedQR, btw, and it's a metal backup device for your seedphrase, made in Germany. I bought it at the Prague conference wanting to bring it home to play with it because I hadn't seen one like that before. I really like the design.

The bureaucrats really give you very little choice and I wasn't going to miss my flight, so I ended up letting it go.

Thankfully, the SeedOr guys are going to send me some to my US address so I don't have to deal with this in the future.