Phonak certena bte, Руководство пользователя

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If this should occur, it will prevent sound going
through the slim tube, and may be harmful to the
hearing instrument’s electronics.
The slim tube and dome should be changed every third
month, or sooner if the slim tube becomes stiff or brittle.
Only your hearing care professional should change the
dome or SlimTip. This is to ensure a secure & safe fit of
the dome or SlimTip to the slim tube.
Maintenance