You don't see these things around very often anymore so I had a bit of a hard time finding one. Finally I went to Best Buy and they had them. I purchased two and used them to connect three ethernet cables together bc I needed more length and didn't want to spend money buying a longer cable when I have a box at home of standard sizes (since one usually comes with everything computer related that you buy these days). I was having trouble with a wireless device losing the WiFi signal and going out almost daily, so I decided to run a cable and just hard wire it the old fashioned way. They did the trick. They worked perfectly with no loss of signal anymore. My device stays on all the time. I was concerned that since I used more than one coupler it would affect the signal current but it doesn't. Moral of the story....being that we have and use so many wireless devices these days, go old school and use cheap couplers like this one to directly connect some of the devices in your home. At least the ones that you don't have to move around, like pc's, smart tv's, security cameras, etc. You will save money and reduce the strain on your wireless network by freeing up bandwidth. Sometimes when it comes to technology, as with many things in the world nowadays, newer isn't always better. So just hide the wires and do it the old fashioned way when you can. Then we can stop paying to constantly upgrade our Internet speed!