Are there hearing aids that will not work with Thinklabs One?

While there aren't any hearing aids that "won't work" with Thinklabs One, there are some that won't connect directly nor stream to our stethoscope. Some newer hearing aid systems, such as Oticon OPN and Resound LINX, are designed to work only via Bluetooth with Android and iOS smartphones. These systems have no streamer accessories. All of the accessories that exist for other hearing aids have been eliminated.  Therefore, they do not work with anything other than a smartphone. So, there's no way to connect any other external sound source - Thinklabs One or any audio devices. 

Thus, the ONLY way to use Thinklabs One or any stethoscope with these models is with headphones worn over the hearing aids.