Professional Wire TrackerThis instrument is a multifunctional portable cable testing tool. It has wide application with reinforced cable types and multiple functions. It is a necessary testing tool for engineering telecommunications,cable engineering and network maintenance. Wire TracingAble to quickly find the required line pairs among many. It is adaptable to the RJ45 terminal of the network cable, the RJ11 terminal of the telephone line and other metal wires via the supplied clip adapter. Sensorsensitive, stable and reliable. Wide ApplicationThis wire tracker is widely used in cable and wire maintenance. The measurement area includes line tracking, short circuit test, clear/busy/ring identification. Continuous or variable tone generatorselectable. Indispensable tool for electricians. Extra EarphoneIn a noisy environment, you can put on the earphones to accurately find the target cable by comparing the strength of the "beep beep" sound. Adjust the volume button so that the volume is correct and avoid being embarrassed. Have a great time shopping!