Summary: It is wonderful that the speaker can wander freely without worrying about getting in front of the projector. Ours is permanently installed above a 4 by 8 whiteboard. The projector is capable of a screen taller than 4'. You can write on the whiteboard and the only shadow is your arm. We had it professionally installed so you just plug in the laptop or PC and turn on the projector. The room we use is normally a 75 person lunch room.