Xtenzi External Bluetooth Microphone Mic Assembly for Dual Axxera Car Reciver Replacement mic Microphone for Dual or Aeeera car stereo Radio cd Reciver kit, Fit to select models like XDMA6415 , XDMA6630 , XDMA6540 , XML8150 , XDMA7800 , XDMA7600 , XDMA7200 , X2DMA500, XDMAR6720 , XDMA7650,XDVDN9131,XDMA6510 it's highly improved the speech quality of hand free car kit communication system. Easy to install mount, 3Meter Long cable,Standard Operation Voltage: 4.5V Operation Voltage: 1.0V-10V.DC Adopting electret condenser cartridge with high sensitivity , low impedance , anti noise and ant jamming capability ,