SideTrak - Swivel 15.6" Attachable Portable Monitor

UPerfect brand has been fairly reliable for me. That said, a 4k monitor under 17in provides little visible benefit especially for movies, and may be troublesome for you because of how sensitive almost all monitors are to cable quality and signal dropout -- most will drop down to 30hz at 4k unless you also drop 50 bucks on a very good cable and treat it with utmost care. After going through about a dozen different portable screens, the ones I find most useful are FHD with a built-in stand (not a floppy cover, just slide it in facing your laptop for travel) and vesa mount holes. For work, I found this dual-screen one ( https://www.amazon.com/dp/B0D45LM2S7 ) to be a true game-changer, with the effective total screen size of a 21in monitor, and it works on windows and linux without a driver or any hassle. For an ultra-compact alternative have a look at this one ( https://www.amazon.com/JoyReal-Portable-Touchscreen-Extender-Temperature/dp/B0C776ZZBH/ ) with a smaller screen but built-in speakers and stand, great for streaming movies and good sound. Lastly, the largest single screen that would still fit in a normal-ish laptop bag is this one ( https://www.amazon.com/UPERFECT-Adjustable-Ultra-Slim-Lightweight-Frameless/dp/B08L5SRCZJ/ ) also with a great built-in stand that protects ports while not in use, but the price jumps from ~150 for FHD to 350-500 for the 4k version.

I purchased a [SideTrak Swivel](https://www.amazon.com/stores/SideTrak/SideTrakSwivel_PortableMonitors/page/4C223789-6E49-413D-AA51-59B16B64ED33?ref_=cm_sw_r_apin_ast_store_B7BW037F67S73CKAQQ8Q) portable second monitor about a year and a half ago and have been very happy with my purchase. It attaches to the back of the laptop with a magnet sticker you stick on the back. It is portable and great for travel, and only needs a dual USB-C to work. I took it to Europe last year when defending a series of depositions and it worked beautifully for simultaneous note taking and tracking exhibits.

I use sidetrak, pic quality is poor but it works. I dunno about its refresh rate. u can find it on Amazon, it atttaches to my macbook air screen with a magnet with no issues

I use a sidetrak, it attaches to my macbook via magnet, no separate stand necessary