Long cables and metal pipes act like a receiving antenna that are able to pick up electro- magnetic fields (e.g. from long-wave transmitters). This leads to magnetic field noise generation around the cables. The MIT-Cable Detector receives the magnetic noise and converts it into audible signals. To perform a search, the device must be moved over the search area. A sound signal indicates the localization of a cable. Additionally, its depth can be determined by tilting the device. The supplementary transmitter also allows cables to be traced that emit only a weak signal.