Multifunction Cable Tester: This MS6812 cable tracker includes a sensitive sensor module that can quickly detect and react to problems in the working circuit. Professional and safe wiring tool, trace the wires or cables and diagnose the break point within a group without damaging the insulation. Network Cable Check: The cable break detector detects the passage of cables or wires without damaging the insulation. Check if the cable is continuous. Receiving audio signals over a cable or line (telephone line). Tells you the status of the phone line, whether it's dead, ringing or busy. No need to call or spend more, you can do it yourself and fix it. Multifunction: Not only suitable for Ethernet LAN, RJ45 internet cable, RJ11 telephone line, but also for power and speaker cables when connecting with the alligator clip. Easy to Use : is a powerful and reliable device that can locate all types of cables and diagnose breaks. It can also check the status of the network and telephone lines. It can be used by anyone with its user-friendly design. Easy to Wear and What You Get: Small, light, easy to carry, long life, low power consumption, compact and safe. 1 x transmitter, 1 x receiver, 1 x test leads, 1 x carrying case (battery not included).