Audio Eavesdropper, Hear Conversations Through Walls

Audio spy: hear conversations through walls. This spy gadget allows you to conveniently and anonymously hear and even record conversations and noises through walls and barriers. For both personal and professional use.
It's very simple to use, just insert the earphones and place the audio microphone on the wall. The appliance works by amplifying sound vibrations. The sensor in this audio spy gadget detects the vibrations that are blocked by a wall, roof or floor and amplifies them so that you can hear what is being said. If the sound wave is weak because the other people are talking in low voices, you can use the volume dial on the back of the appliance to adjust the volume and increase the amplification, or reduce it if the noises or voices are very loud.
It works on wood-panelled walls, brick walls, doors, windows, metal sheets and other materials. The distance depends on the thickness of the wall. The appliance operates best when walls are between 15 and 25 cm thick. It also works well when the source of the sound is at a distance of more than 10 metres, depending on the volume of sounds on the other side of the wall.
The other advantage is that the audio listening device comes with 3.5 mm headphones and an output socket. Although it does not include a recording device, you can connect it to a voice recorder using the output socket so that you have an audio recording.