Scosche MOTORMOUTH III BTAXS2R is a Bluetooth handsfree car kit that allows you to make and receive calls, play music, and use other audio features wirelessly through your car's stereo system. It connects to your car's AUX-IN jack and pairs with your Bluetooth-enabled device, such as a smartphone or tablet. Once paired, you can use the multifunction button on the BTAXS2R to control playback, answer and end calls, and activate voice commands. The BTAXS2R also has a built-in microphone for clear call audio, and it can be used as a speakerphone for hands-free calling.