Network Cable Tester RJ11 Toner Wire Tester Wire Circuit Tester Tone Line Detector Networking Tool [Flexible Use]: Evaluate the continuity of cables or wires[Adjustable Sensitivity]: Track cables or wires and diagnose the break point.[Trace Cable or Wires]: Receive the tone signal on the cables or wires (telephone line); Send a single solid tone or an alternating double tone to cables or wires of the object [Easily test telephone systems]: identify the state of the working telephone line (clear, ringing, busy) [Wide compatibility]: The wire tracer can be used as wire tracing, short circuit checking, open circuit locating, wire identification.Features:- Judge the continuity of cables or wires.- Track cables or wires and diagnose the point - Receive tone signal on cables or wires (telephone line). - Identify working telephone line status (Clear, Ringing, Busy). cables or wires of the item.Package List:1 x Cable Tracker Transmitter with RJ11 Cable1 x Cable Tracker Receiver1 x User Manual Note: The data are all manual measurement, please understand please allow 1-3cm error, due to the light and display difference, there will be some color difference, depending on the physical object received.