SuperTooth Buddy Bluetooth Visor Speakerphone Car kit-Black
This item exceeded my expectations. It lasts long on a single charge and the volume is very loud and clear.  The only draw back, which is ok if you remember to turn it off, is it has a long range.  A couple of times I answered my phone and thought I had a bad connection, but what was happening is this device was staying connected even though I was several yards away from my vehicle.