oticon miniBTE Alta, Инструкция по эксплуатации

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When to replace a battery
When it is time to replace the battery you will hear two beeps
repeated in moderate intervals until the battery runs out.
Two beeps
= The battery is running low
Four beeps
= The battery has run out
Battery maintenance tip
To make sure the hearing aid is always working, bring spare batteries
with you, or replace the battery before you leave home.
Note: The batteries need to be replaced more often if you are streaming audio or music to your hearing aids.