Features: New design of digital signal with strong interference and no noise. Trace and locate RJ45 (even STP / 4-core), RJ11, USB, BNC cables with interface on the transmitter. Wiremap Function: check wire (RJ45 BNC) continuity, such as open, across, short and split. Port Flash function: locating the target cable wire (RJ45) by the flashing port on Hub/switch. Comes With Earphone: great for using in noisy environment or private search in crowded places to avoid interference. Wide Application: necessary testing tool for telecommunication engineering, internet bar, network maintenance, etc.