oticon minirite, Инструкция по эксплуатации

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When to replace the battery
When it is time to replace the battery, you will hear three tones repeated
in moderate intervals until the battery runs out.
Three alternate tones *
= The battery is running low
Four descending tones
= The battery has run out
Battery tip
To make sure the hearing aid is always working, bring spare batteries
with you, or replace the battery before you leave home.
Note: Batteries need to be replaced more often if you are streaming to your hearing aid.
* Bluetooth® will be turned off and it will not be possible to use wireless accessories.