Uses a matched transmitter/ receiver pair from Motorola or Industrial Fiber Optics Co. Allows you to send sound through plastic 1mm fiber optic cable. Two circuit boards with a microphone at one end and a speaker at the other (14' fiber optic cable included). The maximum range is about 220 yards. This can be a Science Fair winner. A two board kit, enlarge either board for a better view with a "click."

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