[Multi-function line tracker]: This line tracker can quickly find the target line pairs in many pairs of lines; quickly locate the breakpoint without opening the wire cover; test line level, positive and negative polarity; test the physical connection status of the network cable ; test the status of the telephone line, etc. [Safety Test]: The receiver probe is designed with ABS insulation to protect you from electric shock while increasing sensitivity. [Quick Test]: Efficient function switching dual knob design; easy to find a single RJ11, RJ45 wire or other metal wire in a set of cables [Easy to test]: Hands can operate the transmitter or receiver independently, no need for multiple testers [Built-in flashlight]: LED lights also help in low light conditions, as well as signs of low residual power, reminding you that it is time to replace the battery., Weight: 0.4 pounds, Manufacturer: Bside