RJ45 coupler Allows you to connect two short ethernet cables into reasonable length without the need to buy longer ones. Ethernet coupler fully shielded to prevent electrical interference. Incredibly easy to use, Insert the network cable at both ends, Plug and play. Thickened PCB Board, Robust and Durable. Supports POE applications over Ethernet patch cables. The ethernet cable extender is suitable for a variety of network cables, such as Cat6/Cat5e/Cat5 network cable. Please Note: RJ45 coupler not waterproof. 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. Color: Blue Package Contents 10 x RJ45 Coupler