Xtenzi External Bluetooth Microphone Mic Assembly For Alpine Car DVD Navigation Adopting electret condenser cartridge with high sensitivity , low impedance , anti noise and ant jamming capability , with fast and accurate data transmission, which could guarantee the voice clearly and stably under kinds driving occasions, it's highly improved the speech quality of hand free car kit communication system. Adopting humanity design with U shape fixing clip , is more easy to install and reliable. Ref ALPINE part no: Alpine N04G0008, Alpine 50-14386Z01, Alpine 50-14386Z02