Features:Can be used for: telecommunication engineer, wiring engineer and network maintenance engineer, etc.Suitable for directly hunting for cables with RJ45 connectors, telephone wires with RJ11 connectors and BNC connectors.Cable sorting is a process of detecting physical connections in a cable like open circuit, short circuit, wrong circuit and reversed circuit.Use the emitter to detect line level or positive and negative electrode.Two ways to detect connected states of circuits.Note:Please read the operating manual carefully and observe all the warnings and notes strictly.