Audix FireBall Harmonica Microphone Dynamic moving coil transducerVLM (very low mass) Type B capsuleCardioid pickup patternSensitivity: 1.9mV/Pascal @ 1k50Hz-16kHz frequency range150 ohms balanced impedanceMaximum SPL: &gt;140 dBOff-axis rejection: &gt;23 dBAluminum housingAnodized finish4-1/2 oz3"L