Check the listing for details. Audi Bluetooth streaming handsfree calls AUX MP3 iPhone iPod Sony HTC A4 2007 >. Condition: New. Listed at 155.87 USD. The new CTAADBT004 Connects2 Bluetooth Handsfree Interface for Audi A4 provides a versatile dual solution for your vehicle. It provides you with a way to stream music from any smartphone, mobile device or tablet to your original factory fitted car radio, whilst simultaneously giving you a Bluetooth hands-free calls solution. In addition, the interface’s AVRCP technology works seamlessly with your vehicle and allows you to control your music via your car radio or steering wheel controls. IMPORTANT: This adapter requires an external CD changer input. Some newer models that have an internal CD changer so do not support the connection of an external CD changer. Please ensure that your radio is capable of running an external CD changer before ordering this adapter. Your radio handbook should h.