Product Description External Microphone Assembly For Car Radio Head Units With 3.5mm Input. Technical Details: Polar pattern: Omni directional 3.5mm connector Sensitivity:-30dB+/-2dB Frequency Range: 50Hz-20KHz Output Impedance: ≤2.2 kΩ SNR: >58dB Standard Operation Voltage: 4.5V Operation Voltage: 1.0V-10V.DC Wire Length: 3 m (9.84ft) Package content: 1x 3.5mm Microphone