Good quality headset adapter compatible with Lenovo laptop, and presumably others too. I know there's another review here saying that but I want to help the search engine rankings, given how long it took me to discover this page!
Unlike another 4 pin adapter I bought elsewhere, this one actually connects all the pins and appears to be made from good quality materials. I can bend the cable without feeling it's going to snap. I see everybody else has given it 4 stars but I'm going to push the boat out and give it 5.