Your hearing aid will arrive with pre-installed size S (small) click sleeves. If those aren’t comfortable, try changing to one of the other three sizes provided (XS, M, L). Choose a smaller size if the hearing aid is pressing on your ear. Choose a larger size if the hearing aid feels loose or makes a whistling noise. Also, note that your left and right ear may be slightly different sizes, so feel free to use different size sleeves in each ear. To learn how to change the click sleeves, check the Product user guide.
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