You can slide the projector up or down on the base for a vertical shift up a wall or ceiling. The GV50 used auto-keystoning to map to my projector screen, and it worked well. You can use the projector on battery charge alone for a few hours, but the device will dim a little bit to save power. Picture Quality and MoreThe GV50 is not trying to be a cinematic marvel by any means, but the projector failed my typical Spears & Muncil benchmark tests. In the demo reel tests, the 1080p quality and lack of good contrast and brightness were much more obvious.