Earthworks Audio M23, Measurement Microphone, Directional characteristic: omnidirectional, Frequency range: 3 Hz to 23 kHz + -1/-3 dB, Sensitivity: 30 mV/Pa, Amplifier type: Discrete Class-A, Max. SPL (sound pressure level): 140 dB, Requires 48 V phantom power, Dimensions: 165 x 22 mm, Weight: 160g, Includes a microphone clamp and adapter from 5/8"" to 3/8""