Goliton? Car DVD Nvigtion Bluetooth Microphone Mic Assembly for Pioneer CPM1084 CPM1083 High quality and low noise mic for Pioneer in dash car receivers. The is an optional external microphone for select Pioneer in-dash head-units with built-in Bluetooth that feature a 2.5mm microphone input. The Mic will provide better performance in noisy environments. This is aftermarket part that will work with most pioneer models in-dash car radio