A. [Easy to use] This cable tester can quickly and easily find breakpoints without opening the cable sheath. It can receive audio signals through cables or wires (telephone lines) and inform you of the status of the telephone line, such as idle, ringing, or busy. Moreover, it can check cables without interfering with cable installation. B. Sensitivity test: The MS6812 cable tracer is equipped with a relatively loud speaker. Even when the tester is in a noisy environment, it can trace cables and identify cable problems more accurately. It can also determine the status of commercial telephone lines (broken, ringing, busy). C. This wire tester has a sensitive sensor module that can detect and respond to problems in the working circuit. With this tracing system, you can install, debug, and maintain one or more telephone lines around your home or office. D. [Function] The wire detector for robotic lawn mowers can check the continuity of wires and detect short circuits, open circuits, and cross - connections. The effective detection distance is up to 3000 meters, and the operation is simple and convenient. E. [Packing list] 1 transmitter, 1 receiver, 1 user manual, 2 batteries. F. Product: Sensitive sensor module. This cable tester is equipped with a sensitive detection module that can check the continuity of wires and detect short circuits, open circuits, and cross - connections. G. Scope of application: Power maintenance, monitoring, installation in Internet cafes, hotels, and network computer rooms, as well as network line engineering. H. Without damaging the insulation layer: The cable detector can detect the passage of cables or wires without damaging the insulation layer, check the continuity of cables, locate cables or wires, and diagnose breakpoints.