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This Listen via the Wall Device could present vital evidence for any private detective and private investigator as it can choose up even minute sounds, via a special amplifier, by means of walls, windows or partitions. Attached to the amplifier can be a highly sensitive ceramic microphone which is developed to choose up vibrations which are converted into a voltage which might be then be produced into audible sound. The amplifier has an adjustment to allow the sounds to be heard clearly and in the needed volume.

Private detectives and private investigators can merely hold the device to the surface in question, up to 300mm thick, after which listen in by way of stereo headphones. All of the evidence could be recorded by connecting a recording device, for example an MP3 player, into an audio output socket. A 9 volt battery powers the listen via the wall device and will give private detectives and private investigators up to 24 hours of use. This is surely a very useful piece of kit for each and every private detective and private investigator.

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