2.5mm connector Hands free external Bluetooth microphone For Pioneer Indash to enhanced sound qualitySpecifications:1.Polar pattern: Omni directional Mic diameter's 9.7*4.5mm2.Plug: 2.5mm connector3.Sensitivity:-30dB+/-2dB4.Frequency Range: 50Hz-20KHz5.Output Impedance: ≤2.2 kΩ SNR: >58dB6.Standard Operation Voltage: 4.5V Operation Voltage: 1.0V-10V.DC7.Wire Length: 4 M (13.1ft)8.Ref Accessory Type: the Pioneer CD-VM19.Compatible for :PioneerPackage inculded:1*Microphone