Olympus ME12 Noise Cancelling Mic.Noise cancelling plug-in microphone, Reducing background noises, To improve voice recognition application.Digital voice recorders provide great solutions for voice recognition applications, however background noise will sometimes cause a problem.The ME-12 plugs into your digital recorder's 3.5mm microphone jack for uni-directional recording in high-noise environments. It will cut down on much of the background noise and result in a more accurate transcription.