SMALL MEMBRANE CONDENSER MICROPHONE Miniature condenser microphone with gooseneck and adapter designed for metal wind instruments. Polar pattern: cardioid. Frequency response: 40Hz - 20KHz. Impedance: 250Ohm Off-axis attenuation:> 20dB. SPL Max: 135 dB. Sensitivity: 5.8 mV / Pascal. APS-910 phantom adapter included. Gooseneck clip, foam and carry bag. Download complete specifications sheet in pdf in this link ...

http://www.audixusa.com/docs_12/specs_pdf/ADX20i:ADX20iP_v4_0517.pdf