Professional Wire Tracker: CE Certificate, design to judge continuity of cables or wires, track the wires or cables and diagnose the break point within a group without damaging the insulation. Telephone Line Checker: It can identify the state in the working telephone line, Clear, Ringing, Busy. (Only the transmitter can be detected). Network Cables Verifying: Plug one side of the cable into the emitter and the other side into the receiver. Select "Network" to check and verify the network cables working status. Tips: Send a single solid tone or a dual alternating tone to the object cables or wires; receive the tone signal on the cables or wires (telephone line). Application: Suitable for not only Ethernet LAN, RJ45 internet cable, RJ11 telephone line, but also electrical and speaker wires when connecting to alligator clip. (NOTE: make sure the wires should be in power-off status). Features: Perfect for installing, debugging, maintaining telephone line and other wires or cables. Detect continuity of the cables or wires without damaging the insulation. Track the cables or wires, and diagnose the break point. Receiver the tone signal on the cables or wires (telephone line). Identify the state in the working telephone line (clear, ring, busy). Send a single solid tone or a dual alternating tone to the object cables or wires. Include a sender (MS6812-T) and a receiver (MS6812-R). A professional & safe tool for wireman. Specifications: Send tone frequency: 1.5 kHz Receive frequency range: 100 ~ 300 kHz Power supply: 6F22 (9V) Receiver size: 23.8 x 4.3 x 2.6cm Emitter size: 14.5 x 3.5 x 2.5cm Receiver weight: 106g Emitter weight: 114g Package size: 25.5 x 12 x 4cm Package weight: 371g NOTE: The line to be tested must not be in a state to be electric, or the signal interference will affect the detection results.