Widex C-9 - Manual (Page 18)

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The word “OFF” is clearly visible on the switch
when the hearing aid is turned off .
Note: Another way to verify that the hearing aid is turn-ed on is
to cup it in your hand. If it is on, it will whistle.
Please remember to turn off the hearing aid when it is not in use .
Remove the battery if the hearing aid will not be used for several
days .