Features: 1.WIRE TRACING: Line finder is suitable for RJ11, RJ45 and other metal wires that can be found through the transmitter, quickly locate the breakpoints without damaging the outer layer of the wire. 2.TELEPHONE LINE TEST: Wire tester detects various working states of the telephone line, which can only be detected by the transmitter, such as determining the TIP to determine the working idle, ringing and off hook states of the telephone line. 3.DETECTION OBJECT: Line detection is the detection of open circuit, short circuit, wrong circuit and reverse physical connection of the line. 4.SENSOR SENSITIVE: Multifunction wire tracer multi frequency pulse, sensor sensitive, stable and reliable, easy to operate, it is widely used in our life and work. 5.FLEXIBLE INTERFACE: LAN tracer has a flexible interface, energy saving switching, and the protective case provides safer protection.specification:Item Type: Wire Tester Material: ABS Power Supply : DC, 9V Stacked Battery x2(Battery Not Included) Maximum Operating Current. Transmitter 10mA; Receiver 30mA Signal Transmission Format: Multi frequency Pulse Testable Wires: Twisted Pair, Telephone Line, Video Cable, Ordinary Metal Wire, Network Cable Testable Interface: RJ11, RJ45 Signal Output Level: 8Vp-p Signal Transmission Distance: 2kmPackageList:1 x Set of Cable Finder (Battery Not Included)1 x Instruction Manual1 x Earphone2 x Cable1 x Clip Adapter Cable