Not just for Shure products, this will work with ANY headphones or for that matter speakers, car adapters, etc...

Actually serves four purposes:
1. Headset adapter for iPhone's non-standard plug
2. Audio extension cord
3. Simple remote control,
and most importantly....
4. Turns any headset into a phone headset.

It works flawlessly, button works to play/pause/skip and to answer and end calls. A great accessory if you already have a set of headphones.