MJ-868 Wire Tracker is a professional-grade diagnostic tool used for testing, tracking, and verifying the condition of various communication cables. It is primarily designed for telecom and network maintenance. It quickly identifies and locates specific wire pairs within complex bundles like RJ45 Ethernet, RJ11 telephone, USB, and coaxial cables. It helps to detect fault, physical wiring issues including open circuits, short circuits, miswires, and reverse connections. Also help to find where cable break without stripping the outer sheath by detecting changes in the tone signal. It is used to evaluates working telephone lines to determine their status, such as idle, ringing, or off-hook. It has a bright LED spotlight for working in dark environments and an adjustable volume control with an earphone jack for use in noisy areas.