I do not know it but also ...

The voice quality is very good indeed. I speak both at himself and listening no problems. Unfortunately, this part is very loose and when you move your head, then it wobbles but very. This may even turn out to be positive, however, as my old BT-HS has caused pain for some time.

UPDATE:
It works fine with my Galaxy S i9000. Both phone and the keys on the HS harmonize well with the phone.

+ **** A star