I’ve been stopped for my signing device before - depending on the model, I’ve gone with, it’s a phone or it’s an encryption key for work.

how many bombs did you see on x-ray?

multiple phones, lap tops, headphones will get ya too. Happened to me many times. doesn't help that I keep a lock on my bag so they can't open without my permission 🤪

Cigars, travel size humidor with humidity meter and earphone wires were pretty rash too. Fortunately it was Cuba. They had probably seen it before.