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This multifunctional network cable tester is engineered for daily LAN and telephone line detection. It is fully compatible with RJ45 network ports, RJ11/RJ12 telephone ports as well as CAT5 and UTP cables. Clear LED lights display wiring status in real time to efficiently identify open circuits, short connections and miswiring issues. Simple plug-and-play operation needs no extra configuration. Small size and easy carrying make it an essential networking tool for household network arrangement, office line maintenance and professional network engineering.