Siemens MUSIC Pro Pro IT User Manual page 18

If the hearing instrument is too quiet
or you hear two signal tones within one minute.
Most likely, you need to insert a new battery. If it is
still too quiet, clean the instrument, following the
directions given in the chapter "Tips for cleaning
and care".
If neither a new battery nor cleaning helps, as a
precaution ask your hearing instrument specialist
to test your hearing again.
If the hearing instrument does not work at all
Is the instrument turned on? Is the battery
compartment completely closed? Is the battery
inserted correctly? Is it possible that the battery is
dead? If none of these hints help you, you should
visit your hearing instrument specialist.
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