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This RJ45 female-to-female coupler combines Ethernet extension with professional surge and thunder protection. It effectively absorbs lightning strikes and instantaneous voltage surges to protect routers, computers, cameras and other wired equipment. Supporting 1000Mbps gigabit bandwidth, it maintains low signal loss and stable data transmission. Simple plug-and-play installation with durable shell design provides long-term reliable safety protection and network extension for indoor and light industrial network systems.