Features:
for installing, debugging, maintaining telephone line and other wires or cables.
Detect continuity of the cables or wires without damaging the insulation.
Check whether the cable line is continuous.
Track the cables or wires, and diagnose the break point.
Receiver the audio on the cables or wires (telephone line).
Identify the state in the working telephone line (idle, ringing, off-hook).
Send a single audio or a audio to the object cables or wires.