Features ● Sound and Light Instruction ● Cont and Tone LED Light Applications - Judge Continuity of the Cables or Wires - Track the Cables or Wires, and Diagnose the Break Point - Receive the Tone Signal on the Cables or Wires(Telephone Line) - Identify the State in the Working Telephone Line(Clear, Ringing, Busy) - Send a Single Solid or a Dual Alternating Tone to the Target Cables or Wires ACCESSORIES ● Battery and User's manual GENERAL INFO