Goliton? Car DVD Nvigtion Bluetooth Microphone Mic Assembly for SONY XAMC10 / XA-MC10 free external Bluetooth microphone For Sony Indash to enhanced sound quality This an optional external microphone for select Sony in-dash head units with built-in Bluetooth that feature a 3.5mm microphone input. The microphone can also be used with external Bluetooth interface module . The Mic will provide better performance in noisy environments.