Review on 5-Pack RJ45 Coupler Ethernet Extension for Cat7/Cat6/Cat5e/Cat5 Network Cable - Female to Female Network Connectors (Blue) by Chad Siofele

The device works. Join 2 cables together to increase the length. The devices are compact and not very bulky. And they work without instructions. Ideal when the power cord is not long enough. Please note that I have not used them to connect to ethernet phones. I do NOT know if they work for Power over Ethernet. But for pulling a cable to a computer, they are ideal.