The easy-to-replace, passive audio filters adapt the frequency response to your individual listening preferences and provide crystal clear, luscious sound. The purpose of this filter is to provide you with the best quality sound that matches what you would hear naturally when not wearing ear tips. Hearing differs significantly from one person to another, and unlike standard earphones, Audeo PFE allows you to select the filter that works best for you.
Product Title: Phonak Audio Filter - Grey
URL: Manufacturer Link