Ultimately, like with other pico projectors in its class the main attraction of the MPro110 is its tiny size and light weight, as well as being battery operated. The 3M MPro110 projector comes with an internal rechargeable battery. We ran the 3M from full charge, twice, and both times it lasted just a few of minutes over one hour, before the battery gave out. More on the battery, later. I find that this 3M LED powered pico projector can produce a respectable image in a mostly darkened room from very small, say 12 inches, to about 24 inches diagonal. Fully darken the room and you can go larger. In a fully darkened room, the MPro110 can produce a barely bright enough image up to almost 50 inches (40 inches wide), which is also about as large an image as it can focus. Even 3M seems to agree, in their literature, they use "up to 50 inch" in describing how large an image they consider maximum. The focus limitation makes sure of that.