It is cable tester for ethernet network cables, and RJ11 telephone cables.Correspondingly -twisted cables 1, 2, 3, 4, 5, 6, 7, 8 and ground. Keep your network running smoothly by testing wrong connection, short circuit and open circuit. Features - Material: PC. - Size: 10.20X9.50X2.70cm/4.01X3.73X1.06 inch. - Battery: 9V battery (not included). - Interface: RJ11/ . - The easy-to-read LED display shows the problem. Handheld and easy to carry. - Automatically runs all tests and inspections by testing cables to detect faulty short circuits, disconnected wires, cross pairs, and other wire faults to keep run smoothly. - It is used to test your self-made Ethernet wiring cable to make sure it works normally before connecting to your device. - It is used to test cables, RJ11 telephone lines and network cables. - It can easily distinguish cable, continuity, open and short; Verify the cable continuity through the remote controller kit, open, short wire and crossover wire pair. Package list: 1 x network cable tester