Effective Expansion: This female-to-female coupler is suitable for extending an Ethernet connection by connecting 2 short network cables together. Dustproof and electrostatic proof package Universal Compatibility: 8P8C RJ45 coupler jack is compatible with Cat8, Cat7, Cat6, Cat5e, Cat5 network cable Safe and Durable: The contact area of the plug has been specially treated and tested, which can withstand 10,000+ times of plugging and unplugging, keeping the connection stable and reliable High-speed Data Transfer: Mini pocket. Plug and play. No driver required. Compatible with TIA/EIA 568-C.2 standard and RoHS certification Metal Shield: Resistant to electrical interference. ABS housing is corrosion resistant. It can still work stably in harsh environments