Review: ViewSonic M1 Pocket Projector
https://www.storeboard.com/blogs/general/viewsonic-introduces-the-compact-and-ultraportable-m1/1491578
Viewsonic Mini Projector M1 Led Explained As you will rarely apply your projector anywhere that doesn't have a power outlet, it's inconvenient to need to tailor your use around the length of time the battery