@maxirosson what do you think about newly announced open source hardware wallet called Portal, made by TwentyTwo?
This looks like interesting new concept of device that works without cables or batteries, and it is connected with smartphone via NFC connection.
One thing I noticed on their video is small screen that probably can't show complete bitcoin address at once.
Portal is currently being offered as pre-sale for €89 and delivery should be expected in Q3 of this year, unless something unexpected happens.

Good thing about it is that everything is released as open source even hardware schematics:
https://github.com/TwentyTwoHW/portal-hardware

Official website page:
https://twenty-two.xyz/