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Spy Surveillance: Microphone Systems
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Which spy microphones are best at capturing whispering voices from across a small room when low-to-moderate background noise is present? Battery must last 24 hrs min. - Quora
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Directional Microphone Parabolic Microphone Listening Device, 100 m Monocular with 8x Magnification, Sound Amplifier Hearing Aid Recording with Headphones for Bird Watching, Animals Watching: Amazon.de: Electronics & Photo
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Parabolic Microphones Audio Surveillance
Directional microphone for long range surveillance
SPY NET - Vibrasonic Binoculars With Directional Microphone - *BRAND NEW* EUR 22,83 - PicClick FR
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High Fidelity Wholesale spy directional microphone For Home And Professional Use - Alibaba.com
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Use Earbuds to Make a Directional Microphone - Mini Spy Mic - YouTube
Spy Surveillance: Microphone Systems
SUPER AMPLIFIED SHOTGUN MIC
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Fast Hacks #6 - Laser Spy Microphone - YouTube
Spectra Laser Microphone M+ - Laser listening device
