Directional microphone small diaphragm microphone series rode ntg colour black dimensions 22 x 225 mm weight 126 g suitable for video camera public speaking podcast interview transducer type condenser directivity supercardioid noise level 135 db sensitivity 1khz 15 mvpa impedance 200 ohm frequency response 20 20000 hz inherent noise 16 dba plugs micro usb xlr operating time 150 h material metal