Directly hunt 5E, 6E, telephone wire, coaxial cable, USB cable and other cables. Hub blink for locating network port by the flashing port light on Hub / Switch. Check wiring error in 5E, 6E, coaxial cable, such as open circuit, short circuit, jumper wire, reverse connection. Locate the wiring or connection error. Measure cable length up to 1000m and locate the breakage point. polarity test function measure DC voltage (0.5-60 V) Memory and storage for calibration data. Automatically time-delay shut off and Low battery alarm function.