The DEH-X6600BT CD receiver features Pioneer"s MIXTRAX technology, built-in Bluetooth for hands-free calling and audio streaming, USB direct control of an iPod or iPhone, USB access to music on Android devices (4.0 or later), and Pandora radio ready for both iPhone and Android. In addition to an updated cosmetic design, model year 2014 CD receivers include updated feature enhancements like Bluetooth USB pairing and Siri Eyes Free voice recognition compatibility (for iPhone 4S and later).