-System:Uni-Directional System For Long And Short Distance -Sensitivity: -Short Distance:-45dB -Long Distance:-38dB -Output Impedance: -Short Distance: 1kΩ -Long Distance: 2.3kΩ -Frequency response: 100Hz-16KHz -Power Source:DC 1.5V -Color: Black -Weight: 547g - See more at: http://www.thaihdfilm.net/PD771876-%E0%B8%AA%E0%B8%B4%E0%B8%99%E0%B8%84%E0%B9%89%E0%B8%B2-em_320e_professional_shotgun_condenser_microphone.html#sthash.rRw6FDiG.dpuf