Microphone uses advanced noise reduction circuitry to separate voices from background sounds, effectively reducing extraneous noises from paper rattling, air conditioners and other sounds within the normal voice frequency band. The mode position switch lets you optimize microphone performance in large or small rooms, maximizing the noise reduction effect. Microphone also has a detachable microphone unit for clip use, holder clip, extension cord, windscreen, AA manganese battery and carrying pouch.