This USB-powered Bluetooth receiver plugs into any car radio with a 3.5 mm auxiliary input. It enables a Bluetooth connection to car radios that do not have it, allowing you to play back telephone calls and audio content without a wired connection. It is equipped with a microphone and can be used as a hands-free kit. You can listen to music from your smartphone, tablet, or any device capable of establishing a Bluetooth connection. No software is required. Plug and play.