Microphones Spy wall
Do you need to buy a microphone for wall or contact?
The microphones of the wall or of contact are devices that amplify the audio signal allowing you to listen with full clarity even without being in the room. Its operation is very simple. You should only paste to the wall, door, wall, or pipe the probe and this will pick up all the vibrations conviertiendolas in audible signals. The operation of the microphones on the wall or contact you based on the of a stethoscope. The sound that occurs inside a room when talking, generates vibrations on the walls or structures of the room. Capturing and amplifying these vibrations on the other side of the wall, it is possible to re-convert those vibrations to sound understandable.