1. 2 in 1 Design: This network cable tester integrates the testing functions of network cable and telephone line, users can complete multiple testing tasks with only one device, which is convenient and practical. 2. Supported Cable Type: This line detector is suitable for RJ45 and RJ11 network cable, including 8P 6P and 4P, wide range of applications. 3. Fault Diagnosis: This telephone line tester can not only test the connection, but also detect the cause of the fault of the network cable and telephone line connection, effectively improving the fault diagnosis efficiency. 4. LED Indicator: This network tester is designed with an LED indicator that can clearly display the test results, and the user can know the connection quality of the network connection and the telephone line. 5. Portable Size: This telephone line tester has a portable design, light weight, small size, easy to carry and use, suitable for office or outdoor maintenance, very convenient.