No, I'm not thinking of this BOXi T-200 projector as a traditional classroom projector. What it can be, though is an extremely portable solution, for education, often rural or in poor countries, but also for field trips and other creative purposes.
Teachers (and others such as missionaries) have used projectors like these traveling from village to village, around the world. With some initiative, you can run a projector like this BOXi T200 off of an external battery pack. And that makes it really practical in areas where reliable electric service doesn't exist.
I mention battery pack usage, but understand, Elmo does not, itself offer a battery pack solution. It does, however, run off of a 12 volt 4 amp source. (For comparison, iPads draw at 5 volts, for 2 Amps, so this projector does draw about 4 times the "juice" that an iPad does.)
The good news is that it is 12 volt, and that there's lots of ways of achieving 12 volt with 4 amps, out in the field. A quick search of the web shows, of course, a great many 12 volt rechargeable batteries, that come in all sizes and shapes. Oh, it will be a pain to figure out which one's the best, so you probably wouldn't go this route (as opposed to another projector that offers it's own battery pack), unless you had a very specific need, or more likely, had a need to equip a number of these projectors for portable use. Just make sure that if you use a 3rd party battery or battery pack that it won't exceed the 4 amp maximum. Or think this way: 8 rechargeable C-cell batteries should provide you just about that - 12 volt, and 4-5 amp! Well, I'll leave it to the techies to come up the the best solution they need.