These adaptors are easy to misplace or lose. We all lost one at some point. Especially if you need to switch frequently between minijack and jack. I bought a couple of these for my Sennheiser HD280 and HD25. The have been working flawlessly for a couple of years no, even with heavy use. I'm a field recordist so I use these things in the field, and they get knocked about. They can handle that without any problem