It makes sure you dont get the rumblings of wind in your recordings when your outside, and masks the weight of heavy breaths when used to record a voice in close quarters. However, I was informed that this would be a suitable fit for the Tascam DR05 but it is awkward to put onto the device, covering the record lights at the top of the screen and also covering the line out/headphone jack on the left. Nonetheless, I am satisfied with this product!!