Those are great devices 🧡🧡🧡
You can get a 3D printed case to house it - and you can add on a power switch 🤌.
Meeting with a local Bitcoiner who’s got this sick offline POS system.
It generates LNURL invoices, I was able to pay it with my nostr:npub1mutnyacc9uc4t5mmxvpprwsauj5p2qxq95v4a9j0jxl8wnkfvuyque23vg with no issues.
This is so simple and incredible and since it’s offline there’s a hash code after that you can use to verify the payment was made in the companion app.
Super cool concept. 
Discussion
What device is it?
It's an lnbits device. Can find it here as a kit: