The car radio microphone is applicated for Bench/Laptop/Counter Intercom/Car GPS/Car DVD Player/Car Stereo, etc. Easy installation with 3.5 mm standard plug, plug and play; 3m length cable long distance transmission. The external microphone can be glued to the wall/glass/car door and so on. High sensitivity, low impedance, anti-noise and anti jamming capability. Car DVD Player Microphone can be picked up from the pedestal for the best sound effect. The car stereo microphone gives you better quality sound during transmission, Highly improved the speech quality of hand free car kit communication system. Frequency response: 50Hz-20KHz, Impedance: 2.2K Ohm, Sensitivity (high sensitivity): -20dB ± 2dB (0dB=1uPa). Aftermarket external mic works with most android autoradios stereos DVD Players with 3.5mm input. Also works for Window CE version radio GPS navigation.