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Laser microphones are used for surveillance at over 500 meters distance

Posted Sep 29, 2019 2019-09-29T00:00:00+08:00 by PipisCrew

http://argoasecurity.com/index.php?route=product/product&product_id=263

origin - https://www.pipiscrew.com/?p=15359 laser-microphones-are-used-for-surveillance-at-over-500-meters-distance

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