I have a mini one that was for work presentations (most rooms I meet in now have video screens, so I rarely need it for work) I have used it for films, TV, photos etc.
Miroir M220A
It has a battery, but comes with a powerful USB C charger that you need for film length items. It has HDMI and USB C video, and self focussing, and auto keystoning. LED light source and 720p
I'd watch for resolution, light output and aspect ratio. There were quite a few out there I rejected because lower res, or low light output.