This unit only works well when it's two feet away and line-of sight of my V551. Forget about putting the phone in your pants pocket or on your hip (even on the same side of the body as the headset). After calling Jabra customer service and being assured that the unit should work as I was applying it, I exchanged it for a new one from Amazon. Of course, customer service isn't going to tell you that they have a mediocre design... I returned the second one last week in excange for a Motorola HS850.In the end, cool physical design, poor electronic design!