Smartphone Projector
I'd like to see one of these in action before going out and getting one, but I Want One Of Those.com are selling these smart phone projectors for a very reasonable £16. I don't think there's any power involved, more that the light emitted from the smartphone is directed through the lens and then projected, so the quality probably won't be as good, but it's a cost effective solution if you have exactly this problem!
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