Electronic listening device
Want to feel like a spy? This device will help you eavesdrop on a conversation through the wall. An indispensable thing for a spy. To make it, you will need: a medical stethoscope (sold in a pharmacy for about 300 rubles) and two cheap microphones from a computer (70 x 2 = 140 rubles). Watch the video for the manufacturing process. As a result, you will get a cool spy gadget for about 440 rubles. Useful and simple!
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