This compact system is designed to intercept conversations through walls making it perfect for covert surveillance being conducted in hotels, offices, etc… It’s also an excellent tactical tool for entry teams, standoffs and recovery operations post natural disasters. Undetectable by the human ear, the included accelerometers (microphones) amplify micro vibrations that naturally occur on walls and construction of all types, when someone is speaking. In essence, the accelerometers turn ordinary construction into giant microphones. The result is high definition, stereo audio and methods can even be employed to provide approximate audible location of the speaker.