?Dual Connection? The car bluetooth adapter can be connected to two Bluetooth devices at the same time, which is convenient for you to easily switch and play your favorite music on the two smart devices, reducing the tedious operation of disconnecting and reconnecting. ?Ground Loop Isolator?Plugged this audio noise isolator up and it will instantly take the buzz/hum/static out of your car audio system/radio/home stereo/speakers. Enjoy your clean and clear music!. ?Wireless Music?You can connect to non-Bluetooth car audio systems, home audio, old-fashioned speakers and wired headphones through the 3.5mm AUX equipped with the bluetooth audio adapter to enjoy wireless music at any time, and re-awaken the use of non-Bluetooth devices. ?Auto-On & Auto-Connect?This Bluetooth Car Kit will be turned on automatically when you start the car, then auto connect with the last paired device(please make sure the Bluetooth of your smart device is on before turn on the reciever). ?Hands-Free Call?The built-in microphone of the bluetooth car adapter allows you to make hands-free calls while driving,Hands-Free car kit design also easy to use music controls.The voice activation function can free your hands to ensure safe driving and easy travel.