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Xanboo/Homesite Laser Break Beam Sensor
MintyBeam: Bug a room and transmit voice over a laser beam (also a Super Spy Ear/Stethoscope)
HOW TO: Send Audio/Your Voice Over a Beam of Light
Make a Speaker and Amplifier without complicated electonics
Send Music over a Laser Beam
Laser Audio Transceiver with LM386 audio amp
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