There are two types of acoustic feedback: that produced internally from the hearing aid - indicating a device in need of repair; and the more common external feedback produced by a leakage of amplified sound out of the ear canal and back into the microphone of the hearing aid. Feedback that occurs when the hearing aid is being inserted or removed or when your hand is cupped near the device is common and does not necessarily signal the need for action.
Feedback is more likely to occur in smaller hearing devices because the microphone is closer to the area at which the sound comes out into the ear. So, a behind-the-ear style may be less likely to produce feedback than in in-the-canal style device. To learn more about feedback and how to reduce it watch the video below.
If you have any questions about feedback please contact our helpful staff!