First, of course, is to watch what you need, in my case, I wanted to provide a 5.1 sound from my laptop to my system via an optical cable. But of course you need a Latop also has an optical output. In my case, an optical output was available. He looks like a normal phone jack input, works for me even with normal headphones, but has the designation S / P DIF, which stands for optical signal transmission. The plug fits perfectly, even for the optical cable, almost too good ... Since I have received no signal at the beginning, I did it naturally pushed only once on the product and tried the small plastic layer of the opening of the adapter plug to "prokeln", it works, but is not guaranteed the whole point ..., the fault lay much more with me, the output at the laptop needs to be set with me when inserting the plug on S / P DIF output, but the product also works without the plug in Kunstschoffschicht: D