A Bluetooth head unit is a modern car stereo system that features built-in Bluetooth technology, allowing it to connect wirelessly with a variety of devices—most commonly smartphones. This wireless connection enables convenient features such as hands-free calling, wireless audio streaming, access to playlists, and control over music apps directly from the car’s dashboard. Bluetooth head units improve both safety and convenience by eliminating the need for cables while driving. Many models also support voice assistants like Siri or Google Assistant, letting you manage calls, messages, and navigation without taking your hands off the wheel or eyes off the road.