Review on Upgrade Your Laptop with Mobile Pixels Duex Plus Portable Monitor - USB C/USB A Plug and Play 13.3" Screen Extender 12.5" DUEX Pro by Troy Oumer

This works wonders when you need a dual monitor! I like that it has magnets to attach to a laptop and the screen itself is big enough. You can control the brightness and it's really easy to connect and install. The only criticism is the magnets. After a while, they no longer stick to the laptop. Will probably have to buy more holding magnets or something.