A:Answer Logitech answered your question with an advert for their product. That is LAUGHABLE.
I have a projector (Anker Nebula Capsule Max), with bluetooth, that I use to stream Sunday Night Football out in my back yard. If your projector uses bluetooth, then this is a fantastic option. If it doesn't, well, I mean any other option will do, but for an outside movie projector I feel bluetooth is pretty necessary. What is cool is that if you have multiple Wonderbooms, you can essentially set them up around your viewing audience so you can make double sure that everyone hears. However, I set my single Wonderboom about 8-10 feet in front of my viewing audience, and there are no audio issues whatsoever.