The Bluetooth 3.5mm Aux receiver can turn your old car audio/home audio/3. 5mm wired earphones/speakers into wireless. Compatible with most Bluetooth-enabled devices, such as smartphones, tablets, laptops, and computers. This Bluetooth AUX receiver can pair with Bluetooth devices and the built-in microphone can be used to answer hands-free calls. One key is to answer, reject, end, and redial the last number. Designed with MFB and a volume up/down button, it is very convenient to adjust the volume of the music. Weights only 0.5 oz., a very tiny size. You can take this Bluetooth audio receiver whenever you go. A very good companion for drivers.