The first thing that came into my dingbat little head when I saw this device was this:

And this is a great idea for a start-up: to release a hardware wallet in a phone case

. I mean, phone mimicry. Can release a device under the guise of a chinese phone with a similar design to old phones. When asked
what it is?, it will be possible to answer that this is just a telephone and will save you from unnecessary inquiries.
As you can see from the picture, wallet
Passport is already close to it.