The 145055-410 (ME-52W) plugs directly into digital recorder's 3.5mm microphone jack for uni-directional recording in high-noise environments. Digital voice recorders provide great solutions for voice recognition applications, however background noise will sometimes cause problem. It will cut down on much of the background noise and result in a more accurate transcription. It also comes with windscreen cover, tie-clip and 3.3ft extension cord. When using with recorder with 2.5mm mic jack, purchase the PA-1 Plug adapter (Item #145101-410).