13
feedback
When the instrument is “on,” you may hear a
whistling noise known as feedback when
adjusting the volume control or when using
the telephone.
Feedback is caused by amplified sounds
escaping from the ear then reflecting off your
hand into the instrument’s microphone. It is
more likely to occur during insertion, removal
and volume adjustment. It should cease when
you move your hand.
If feedback persists after the instrument has
been inserted correctly and the volume is set
to a comfortable level, contact your Hearing
Professional.