See more product details Specification:Black RJ45 In-Line Coupler, perfect designed to solve a great extended solution by connecting 2 short network cables to a longer one.1. Connectors: RJ45 8P8C, pure copper Plating.2. TIA/EIA 568-C.2 Verified.3. ECO-friendly ABS cover, RoHS compliant. Compatibility: Cat7/Cat6/Cat5e Ethernet Cable.4. Network Speed: up to 10 Gigabit.Package included:10* RJ45 couplerNote:It is not for a phone cable, but for an Ethernet cable.They are only compatible with RJ45, NOT compatible with RJ11.