Listen through wall device

This highly sensitive wall contact amplifier and microphone can listen to conversations through up to 30cm of solid concrete, walls, windows and concrete/steel floors such as found in many flats. complete with earphones, wall contact microphone & recording socket enabling you to make recordings from it.
The device uses a high gain extremely sensitive ceramic microphone made from stainless steel. The sensor has a magnetic base with a central protruding needle connected to the ceramic sensor which converts the vibrations into electrical audio signals, these audio signals are then amplified so that they can be heard. The amplifier also incorporates an audio filter control adjustment allowing the enhancement or rejection of different sounds. 

Other Applications:
Search & Rescue: Hear people trapped in basements, elevators, under rubble etc.
Diagnostics: Find problems in engines, transmissions and other mechanical apparatus.
Pest Control: Find location of insect or rodent infestations, active termite colonies in walls, ceilings and floors.
Plumbing: Find locations of leaking pipes in concrete or walls.