This remote cable tester is a handheld device with four different test ports: RJ45,RJ11,USB and BNC, used to test the most popular media today. Before and after installation, you can use this machine to check the condition of the cable. The passive module can be separated to test the far end of the installed network cable. One-click testing provides easy operation, and multiple LEDs provide clear test results. When not in use, the unit will automatically shut down. It is suitable for metal lines such as telecommunications bureaus, Internet cafes and telecommunications projects. Cable Tested: UTP and STP LAN cables, terminated in RJ-45 connectors (EIA/TIA 568); RJ-11 cables with male connectors, 2 to 6 conductors installed; USB cables with Type A flat plug on one end and type B square Plug on other end; BNC cables with connectors Faults Indicated: No Connections, short circuit , Opens and Crossover LED lights to indicate low battery Power: 1 x 9 V 6F22 DC Alkaline Battery