Polaroid Digital AIR 3D Use And Maintenance Manual page 149

You may hear a slightly annoying sound that will disappear when the device is
properly positioned within the ear canal. If the positioning is correct and the
sound is still perceptible, try with a different size and repeat the operation. Slowly
adjust the volume as needed. The Hearing aid has seven different volume inten-
sities marked each one by a "beep". The end of the scale, both for minimum and
maximum volume, is marked by two "beeps"
To increase the volume
To decrease the volume
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