Whistle is heard in hearing aids (feedback)
Sometimes there is a sharp whistle in the hearing aid, which is called "feedback".
It may appear, for example, when fixing a device in the ear, when putting clothes on over your head, when you are hugging someone, or even just holding your hand to your ear.
Unitron's hearing instruments use feedback suppression technology. This allows you to significantly reduce the whistle and the associated discomfort.