A 16" 4K USB-C OLED display (with a touch sensor even). It works exactly as advertised and looks really nice but is rather useless for me, to be honest.
It's https://aliexpress.com/item/1005004110616192.html
I think a regular IPS display would be way less susceptible to burn-in when used as a dashboard display, though.
As for why I don't use it much: I thought it would be nice to have a second portable screen for my laptop instead of a proper desktop setup, but it's just mildly inconvenient to carry around and set up/pack away every time, and it offers way less usable screen area than a regular-sized display (unsurprisingly).
Why did you get it if it’s useless for you? Not being critical at all, more so curious how it turned out to be a bad fit.