oticon alta Instructions For Use Manual page 41

Cleaning the microphone openings
Make sure that the microphone openings are not clogged by dust or dirt. Carefully brush
away visible signs of debris from the openings. Brush only on the surface and make sure
the bristles of the brush are not pressed into the openings. Be careful not to push debris
into the microphone openings, as this can affect the performance of the instrument.
Microphone openings
39