It is a tutorial video for making a spy bug audio surveillance listening device.
you can Listen from anywhere using phone call.
it is an arduino based new gadget. I have used Sim 800 L gsm module with arduino nano.
Arduino code, circuit diagram & more details - technoreview85.com/hidden-aud...
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Негізгі бет Ғылым және технология Gsm based Spy bug microphone | how to make
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