I have tried over-the-ear blue-tooth devices, my phone's speakerphone, and wired speakerphone devices to make hands-free calls in my car.  There was always too much background noise or my voice sounded too muffled or tinny to be heard.  I researched several blue-tooth speakerphone devices on-line, this one always seemed to come out on top.  I have not been disappointed.  I have used this in my vehicle for a over a year without complaints from callers that they could not hear or understand me.  The one-touch answering and calling makes it simple to use while driving.