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This RJ45 Ethernet surge protector adopts female-to-female coupler design, integrating network extension and lightning surge protection in one. It can absorb lightning induction voltage and instantaneous power surge, effectively protecting routers, switches, surveillance cameras and other network equipment from damage. The rugged waterproof housing adapts to outdoor and harsh installation environments. Simple plug-and-play installation without extra power supply, no impact on network speed and signal quality. Perfect for home networking, outdoor monitoring systems, community weak current projects and industrial network lightning protection.