Earthworks Audio M23R, Measurement Microphone, Directional characteristic: Omnidirectional, Frequency range: 3 Hz - 23 kHz (+/- 0.5 dB), Sensitivity: 36 mV/Pa (-28.9 dBV/Pa), SPL (sound pressure level): 140 dB, Equivalent noise level: 20 dB SPL (A weighted), Requires 24 - 48 V phantom power, 10 mA, Connection: XLR, Dimensions (length x diameter): 165 x 22 mm, Weight: 0.16 kg