RJ45 Coupler RJ45 couplers with RJ45 plugs extend the connection between two Ethernet patch cables. -Compatible with Cat7,Cat6, Cat5e,Cat5 network. -These cat5 coupler didn't slow down your network. -TIA/EIA 568-C.2 Verified, FCC, RoHS Compliant. -These RJ45 couplers are metallic shielded,thickened PCB Boardand ,relatively sturdy and incredibly easy to use. -With 10 pack FREE RJ45 8P8C network cable heads for UTP Cat7 Cat6 Cat5 Cat5e, designed for solid cable crimp on RJ45 connectors. Attention: Please note these rj45 connector fit for Super Category 5 Ethernet, they are not fit for Super Category 6 Ethernet_ Specifications. Color: Blue Package Contents: 6 x RJ45 Couplers Please note: This can not use with a keystone jack. It is not for a phone cable, but for an Ethernet cable. They are only compatible with RJ45, NOT compatible with RJ11.