I find myself in situations where I'm not at my trading station for changes of pace. Recently ran into someone at t a coffeeshop that had one of these with their laptop. Curious what features/specs I should have an eye out for. I have both win and macOS laptops. Looking at MB165B on the low end and the prices seem to range up $$$
Definitely check the performance. Often the screens have a real world performance that is far below a normal screen. I had one that you could see the mouse move as tracers. Another one had to be set so low brightness in order to work for more than 20 minutes, that I could not really see the charts. Others had software drivers required that were buggy wrt power saving mode and sleep mode. Another the screen was not good for looking at any length of time without getting eye strain. Aspect ratios can be non standard and the OS might have font scaling issue. check the cable power requirements. While good not to have a separate brick, you can only draw so much juice with some cables. The last one I considered was the Asus ProArt, but that is very expensive and seemed overkill for charts. But at least the quality should be good for charts. Best of luck. I gave up.
I use a Cocopar 17.3 Inch Portable Monitor. I paid $350 but it now listed for $399 on Amazon. Outstanding picture, the 17.3 is much more readable than the usual 15 inch portable monitor, and it runs off USB-C power so I only need one multi-port Anker power adapter to power all my travel devices.
I have one. It is simple plug, good enough for web browsing and charting. The resolution is limited to 1080p on mine.