Professional car kit microphone, this type of car kit microphone have provided convenience for car interior hands-free calls, voice control and voice monitoring application etc, which can completely avoid the dangers of the phone in one hand and one hand hold the steering wheel when driving. Features : Adopting electro condenser cartridge with high sensitivity , low impedance , anti noise and anti-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. With wide range of application, could use with kinds brand's navigation and bluetooth system. could use for car kit, speaking, chatting , meeting, or configure with amplifier etc. with nice popular appearance and factory price. Technical Parameter: Polar direction: Omnidirectional Mic diameter: 9.7*6.7mm Sensitivity: -56dB+/-3dB (0dB=1uPa) Frequency Range: 50~20KKHz Output Impedance: 2.2 k SNR: >58dB Standard Operation Voltage: 4.5V Operation Voltage: 1.0V-10V.DC Wire: 3 M Package : / piece / PE bag plug : 3.5 mm mono or stereo plug