The IC49 is being used as an inductive coupler for cables which cannot be disconnected. It can also be used as a receiving antenna, clamping around each cable connected to that one terminal block will identify which cable is feeding the house where the transmitting coupler is located. All cables should be tested with the same sensitivity setting for comparison purposes. The IC49 is traditional 7,6 cm budget coupler. Compatible with all A-Tronics-Europe tracing instruments.