Research & Development Center
---How To Books, Projects & Plans---

Subscribe to our FREE monthly newsletter, a Great source for tips, advice and updates. Plus! Free! Software Every Month...



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.







Home    Aircraft    Security    Plans    Software    Energy    Tools    Mind Power    Health Science   
e-Books Library    Mail Order Form

Copyright © 2019 Alternative Technologies