Electronic Listening Device

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