Generally, hearing aid boxes will be marked with IPXX, where XX is two Arabic numerals. The first marked number indicates the contact protection and foreign body protection level, and the second marked number indicates the waterproof protection level. The higher the number, the better the protection level. Dust-proof grade (the first X), what each waterproof grade of hearing aid represents, see the figure below.
Hearing aid protection grade table
So how do hearing AIDS conduct waterproof experiments? You can see the picture below.
So don't worry once the hearing aid falls into the water. Generally speaking, hearing AIDS are waterproof. Take them to a professional fitting center in time.