I purchased this adapter for a surround sound system I have. It is a little outdated but I love it and do not want toget rid of it just to match the updated ports on todays electronics. I happen to come across this adapter and noticed the end of it and learned what the port was in back of my surround system, other than audio visiual. I hooked this adapter up to the outdated surround sound system and ran it to the hdmi on the new 4K flat screen and bingo I finally could play different things through this surround system. I was even able to finally third party the sound of my PS4. I love this little gadget, it had been outstanding in the last 24 hours.