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This professional network cable tester is compatible with RJ45, RJ11, RJ12 interfaces, and works perfectly with CAT5, CAT6, UTP, USB and Ethernet LAN cables. Equipped with intuitive LED indicator lights, it can efficiently detect open circuits, short circuits, miswiring and connection faults. Simple plug-and-play operation requires no extra configuration. Small and easy to carry, it is a must-have tool for network layout, computer maintenance, line inspection and daily home network troubleshooting.