WIRE TRACING MULTIFUNCTION - Fast to locate the breakpoint without wire's cover damage, Find wire on all types of connected operating Ethernet switch /Router/PC terminal. Perfect for tracking RJ11, RJ45, cables or other metal wire (via adapter) Battery is Included WIRE TRACKER - The Line Finder can trace not only Ethernet LAN wires, but also electrical and speaker wires when connecting to the alligator clip; It is recommended to stripe down some of the wires when connecting through the clip; Select 'SCAN'; Emitter works properly if the 'SCAN' indicator is on; Use the receiver to find target wires. NETWORK & TELEPHONE LINE TEST - The Line Finder testes physical connection status of network cable, such as open circuit, short connection, miswire and reverse connection; Use the emitter to test the status of working of telephone lines EARPHONES DESIGN - With a pair of Earphone, you can just connect the earphone to the headset jack of receive to get clear information in a noise environment