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Surveillance - Wikipedia
https://en.wikipedia.org/wiki/Surveillance
Surveillance is the monitoring of behavior, many activities, or information for the purpose of information gathering, influencing, managing or directing. This can include observation from a distance by means of electronic equipment, such as closed-circuit television (CCTV), or interception of electronically transmitted information like Internet traffic.
Lasermicrophone.com - professional laser microphones
https://lasermicrophone.com/
Our Spectra Laser microphones are professional laser audio surveillance tools that will allow law enforcement professionals to surreptitiously listen in remotely on any premises by using a beam of invisible light as the sound-carrying medium and without any need to break-in or enter the target room. Equipped with cutting-edge technology and ...
Laser Audio Surveillance Device by Demet YALMAN
https://prezi.com/6-abxwvswki9/laser-audio-surveillance-device/
Examples: DetectEar Bug Types of LASER GSM 2060 TP GSM Based Audio: Related to hearing or sound Surveillance: Solid State Lasers Liquid Lasers Gas Lasers monitoring the movements of another person. audio surveillance (aural surveillance), visual surveillance, tracking devices
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