Eximtrade Bluetooth Music MP3 Audio CSR Chipset USB Charger Cable KCA-121B Connector for Alpine Stereo with Ai-NET Interface Bluetooth Music Streaming for Alpine stereo with Ai-Net interface. Activate the AUX mode in the Alpine stereo and connect the smartphone with this bluetooth cable, then you can listen music via the Alpine stereo. The bluetooth cable will automatically connect to your smartphone when the car is started. Simultaneous connection with two smartphones is supported. Press the button to change between the USB mode and the bluetooth mode. Insert the charging cable into the USB port for charging. Bulit-in premium CSR chipset, high quality audio transmission is guaranteed. You have to activate the AUX function in the Alpine stereo to use this product. Please note that not all the stereos have the AUX function, we highly recommend you to check before buying the product.