This is a guide for making a spy Audio listening device. It works like GF-07 or GF-09 mini GPS trackers. That portable GPS tracker has this audio listening feature. you can hear the audio by making a phone call.
this newly invented device also has the same feature. it is a Hidden audio surveillance listening device.
you can make it at home. I made it with an Arduino nano.

Arduino code & more details - [ Ссылка ]


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