No it is not a coldcard.

But it does have a se like a mk series coldcard.

You could be we it as a type of signing device/hhw.

This thing will do all sorts of shit.

It’s a diy device.

Yes you can probably use it as a p2p messaging device (similar to armachat).

Browse nostr not sure really but you could use it to post notes on nostr.

Have you listened to