Great product that does what it should - two Cat5/6 cables over a long distance, HDMI input at one end and the same output at the other.
I ran two CAT-6 cables (Gigatrue from Blackbox) to make sure, to a distance of 22 metres (44 metres of cable). I haven't needed the power supply at the receiver, possibly because of the quality of my Cat-6 cable or because 22 metres is just under the distance where you might.
The quality of the picture at the far end is the same as a 1m HDMI cable would be. These units are similar in appearance to other products on the market but for the price charged, they do the job with no power needed (in my install) and the picture is perfect. I will certainly be buying more for other rooms.
Not sure if it's mentioned anywhere here, but the instructions don't appear to - the CAT5/6 cables should be wired as 568B terminations at each end, so standard 'patch' network cable terminations.