AxcessAbles ODM-2 Microphone Kit for GoProCameras Hero4, Hero3+, Hero3 (Black) * Transducer: Electret Condenser * Polar Pattern: Omni-directional * Power: Receives plug-in power from the GoPro * Frequency Range: 35Hz~20KHz * Sensitivity: -30dB +/- 3dB / 0dB=1V/Pa, 1kHz