The US passed a new law last year that will allow for over-the-counter hearing aids, and it aims to provide adults with mild to moderate hearing loss access to hearing aids without them having to go through a physician first. The FDA is currently working on regulations for the new category of hearing aids. The agency says around 37.5 million adults report hearing loss ranging from "a little trouble" to "deaf."

Though they're not approved by the FDA as hearing aids, a number of companies have developed wireless earbuds that can manipulate and augment sound. Bose, Nuheara and the now defunct Doppler Labs have all released assistive hearing devices in the past.

Update 10/11/18 5PM ET: This post was updated to reflect that the Bose Hearing Aid is not considered an over-the-counter device by the FDA, but is instead a direct-to-consumer device. The FDA is still working on drafting regulations regarding over-the-counter hearing aids, a new category allowed by a law passed last year.