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WOVTE Parabolic Dish Directional Microphone, for Long Range Listening Device up to 300 FT, Monocular X8 Times Long Distance Hearing, Birds Listening Telescope, Camping Tools - Walmart.com
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Amazon.com: CozyHomelover Portable Parabolic Microphone Monocular Bionic Ear for Long Range Listening Up To 300 Ft : Electronics
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Amazon.com : HSTD Parabolic Microphone Monocular, Sound Amplifier Spy Ear Bionic Listening Device, Long Range Listening Device up to 300 FT 8X Magnification for Birds Listening B : Electronics
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Long distance listening - this is a true parabolic microphone tried and tested. I can hear a light whisper at 50 yards animals scratching at 70 yards. : r/3Dprinting
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How to Build a Long Range Laser Spy System for Eavesdropping on Your Neighbors « Mad Science :: WonderHowTo
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