Circuit designed around a matched fiber optic transmitter and receiver pair. Transmitter board uses microphone and IC to modulate an LED. Receiver board demodulates the light and drives the provided speaker. 14ft of plastic cable supplied but boards will drive up to 150M of cable. Runs on 2 9V batteries. Rec. 2" x 1.5" x 0.75". Transmitter 1.75" x 1.125" x 0.5".
The product datasheet is available here to view
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