I have one of these and it allows me to put my access point in my attic. This location for the access point provides great wireless coverage of my house. This enables my access point to be in my attic where there is no power sockets available but I can run an Ethernet cable up there and using this it supplies the AP with power. This is very easy to use, just plug everything in the correct way. And yes there is documentation to help you connect everything correctly.