Easy to use: This cable tester can quickly and easily find breakpoints without opening the wire cover. Audio signals are received by cables or wires (telephone lines). Tells you the status of your phone line, such as idle, ringing, or busy. Safely inspects cables without disturbing cable installations. Sensitivity test: The MS6812 cable detector is equipped with a very loud horn. Even if the tester is noisy, it can track the cable more closely and identify cable problems. Determine the status of the company's telephone line (interrupted, ringing, busy). High quality: This wire tester has a sensitive sensor module that can quickly detect and respond to problems in the working circuit. Easily install, commission, and maintain one or more telephone lines around your home or office with this high-quality tracking system. Function: The robotic lawnmower's wire detector can check wire continuity and detect short circuits, open circuits, and crossover tests. Effective detection distance of 3000m. Simple and easy to use. Packing list: 1 * transmitter, 1 * receiver, 1 * user manual, 2 * battery. Product description Sensitive sensor module The cable tester has a sensitive detection module that checks wire continuity and detects short circuit, open circuit, and crossover tests. Scope Internet cafe hotel network computer room electrical maintenance surveillance network installation line engineering Does not damage insulation Cable detectors detect the passage of cables or wires without damaging the insulation. Check cable continuity. Locate cables or wires and diagnose breakpoints.