Widex D-XP - Manual (Page 17)

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Push the battery compartment cover downwards to turn the
hearing aid off .
NOTE: Another way to verify that the hearing aid is turned 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 sev-
eral days .