Bluetooth Hands-free System

It uses car microphones and speakers. It can stream music. Pairing is done once. Many countries allow phone calls only with hands-free systems while driving, and even then they can be distracting. Echo or poor sound quality can come from the car's microphone position, the phone or network quality. Contacts and call history are usually synced after pairing.

The phone connects wirelessly to the car.

Phone use while driving is regulated. Pairing problems can be fixed by deleting and re-pairing.