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This RJ45 Ethernet surge protector adopts female to female coupler design, enabling convenient network cable extension while providing effective surge and lightning protection. It can absorb instantaneous overvoltage and current interference, protecting switches, routers and surveillance network equipment from lightning strikes and static damage. Solid durable housing adapts well to outdoor harsh environments. Plug and play for quick installation, no driver or extra power required, perfect for home networking, outdoor monitoring system and industrial network line protection.