Camcorder microphone series azden sgm transducer type electret condenser directivity supercardioid suitable for video camera public speaking sensitivity 1khz 224 mvpa frequency response 80 18000 hz operating time 150 h dimensions 216 mm capsule diameter 21 mm noise level 103 db transmission mode cable dynamic range 78 db signal noise ratio 65 db battery supply function onoff switch plug 3 5mm jack power supply lr44 button cell included