BSIDE FWT81 RJ11 RJ45 Network Cable Detector with Modular Connector

[Multifunctional Line Tracker]: This line tracer can quickly find target line pairs in multiple line pairs; quickly locate the break point without opening the wire cover; test line strength, positive and negative polarity; test the physical connection status of the network cable; test the condition of the telephone line, etc. [Safety Testing]: The receiver probe is designed with ABS insulation to protect you from electric shocks while increasing sensitivity. [Quick Testing]: Efficient dual-button switching function; easily find a single RJ11, RJ45, or other metallic wire in a bundle of cables. [Easy to Test]: The transmitter or receiver can be operated independently by hand; no need for multiple testers. [Built-in Flashlight]: The LED lights also help in low-light conditions and indicate low power, reminding you when it's time to replace the battery.