Phonak CROS - Care and Maintenance; Phonak CROS H2 O Water Resistance

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Step 10. Changing the battery
Your Phonak CROS transmitter will indicate with
a double beep, that the battery soon needs to be
changed. You typically have up to 30 minutes to
change the battery, however this can dier and
might be considerably shorter. We recommend
that you always keep a spare battery on hand.
4. Using your Phonak CROS system