BlueAnt S4 Bluetooth Car Speakerphone Kit [USEN-BAW-S4]
We paired 2 phones with it and booth were very easy and took only a few minutes. The voice walk through is great. The volume on the first phone seemed low, but I believe that there was too much background noise when I first paired it. I used BlueAnt's recommendation to reinstall and re-pair the phones. I did, it was quick and easy and the phone sounds great now through the S4.