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You can get small speakers at an electronics store, like Radio Shack. These can act as both transmitters and receivers. When you speak into a speaker it vibrates a permanent magnet within a coil which generates an electrical current. If you run 2 wires between the 2 speakers, you might be able to hear the sound in the other speaker but it won't travel very far--maybe a few feet at most. It would be interesting to try.

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13y ago

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