This Listen via the Wall Device could provide crucial evidence for any private detective and private investigator as it can choose up even minute sounds, through a special amplifier, via walls, windows or partitions. Attached to the amplifier is a highly sensitive ceramic microphone which is created to pick up vibrations which are converted into a voltage which may be then be made into audible sound. The amplifier has an adjustment to enable the sounds to be heard clearly and at the required volume.
Private detectives and private investigators can just hold the device to the surface in question, as much as 300mm thick, and then listen in through stereo headphones. All the evidence can be recorded by connecting a recording device, such as an MP3 player, into an audio output socket. A 9 volt battery powers the listen by means of the wall device and will give private detectives and private investigators up to 24 hours of use. This really is surely a really useful piece of kit for every single private detective and private investigator.
http://www.privateinvestigator-oldham.co.uk