Xtenzi Microphone Assembly for Pioneer Ref Part # CPM1083 Xtenzi Replacement Microphone for Pioneer Microphone Assembly Part # Cpm1083 it's highly improved the speech quality of hand free car kit communication system. Standard Operation Voltage: 4.5V Operation Voltage: 1.0V-10V.DC Wire Length: 4 M Adopting electret condenser cartridge with high sensitivity , low impedance , anti noise and ant jamming capability ,