I needed a replacement headset for an exercise class I teach which was compatible with the existing stereo system. These were the types of mics the facility had previously used, so I knew it should fit. The on/off switch was a little different, but nothing to gripe about. The mic works great, I just wish it wasn't so expensive! Hopefully it will last a long time! Best Buy's shipping was lacking, it was delayed at least three times, I almost thought it wasn't going to make it.