If you have to make a phone call from behind the wheel, go hands-free ... offer Bluetooth technology, which frees your hands by wirelessly connecting your phone to the car's audio system.

To avoid holding the phone by hand, hands-free headsets and car systems use Bluetooth transmission to synchronize with the user's cellphone within a range of about 30 feet. See Bluetooth.

Most new cars also come with a Bluetooth system that allows you to wirelessly connect a phone. It lets you not only dial by voice and talk hands-free but also stream music stored on the phone or ...