Open source software AND hardware. Simple. Good form factor. Relatively Cheap. Intuitive hardware switches.
Discussion
Airgapped and firmware exists to disable Bluetooth entirely.
Besides the things already mentioned, self-custodial LBTC. I don’t know of any other hardware wallet that can be paired with iOS and Android via Bluetooth. Blockstream’s Green Wallet works really well for this. The Windows app is also very simple, and so far, I haven’t found anything I don’t like. You never know which phone you’ll have in the future, and I think wireless mobile use is great in case you ever need it, without the seed phrase being online. Otherwise, you can just add a watch-only wallet to receive Bitcoin.
Yes, all these things are also why I like my jade.
The hardware isn't open source unless you made the chip.
https://www.crowdsupply.com/sutajio-kosagi/precursor/updates/crowdfunding-begins
You forgot to include the part where you destructively decap and image the chip to make sure it matches the HDL, which you can’t.
Is that what IRIS does?
https://www.bunniestudios.com/blog/2023/infra-red-in-situ-iris-inspection-of-silicon/
It doesn’t work very well for smaller details.