I am a teacher. This pico-projector has some advantages (a rechargeable battery lets it work without nearby electrical outlet and has an internal hard drive to project .mpeg or .avi videos without connecting to a PC). careful though autonomy is only an hour and a half times the sound is weak and especially you should be in almost total darkness because the light output is low. To project courses in a lit room it is better to invest in a real projector at the same price.