Don't forget all the little necessities like extra bulbs for projectors, laser pointers, batteries, overhead projectors with transparencies and markers,
microphones in large rooms, and everything else we have already forgotten but that you are already thinking about.
That includes the
microphone array that helps Echo pick up speech even
in a fairly noisy
room, as well as Amazon's own proprietary software for recognizing wake words, reducing background noise and cancelling out echoes
in large open
rooms.