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Ultrasonic Microphone

This Ultrasonic Microphone cannot be found by regular anti surveillance equipment and RF detection equipment. It uses ultrasonic vibrations to transmit sounds that are being picked up. The plans include the transmitter  and the receiver needed to pick up the ultrasonic signal. Plus it also shows how to build a Ultasonic Communications System. Plans Only.

PUM0380....................$9.00

 

 

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