the t.bone MM-1 omni directional measurement microphone - 1/4 inch polarized capacitor capsule, nickel plated body and professionally designed circuitry provides consistency and excellent stability with low noise and distortion, flat frequency response curve makes it an ideal choice for audio frequency analysis and specialized recording techniques. Technical specifications: polar pattern: omnidirectional; frequency response: 20Hz-18KHz; output impedance: 200ohms; max SPL: 132dB; SNR: >70dB; phantom power: +9V to +52V.Clip Included