RJ45 and RJ11 Multi-functional LED Network Cable Tester LAN Network Cable Tester Cat5 Capable to judge wrong connection short circuit and open circuit Grounding Test. Automatically scan mode rapidly testing the streamline shape is in accordance with the design of somatology. Durable design working well even in construction location. Cable Tester for RJ11 RJ45 10/100 Base-T and telephone cable Automatic efficient scan for the miss wiring disorder cable open and short circuit Tests continuity of UTP/STP cables Clear and simple LED display Powered by DC 9V reduplicated battery (not included) High quality soft leather case provides more protection Remotely test cable up to 1000 ft in length ( remote kit included )