oticon CROS miniRITE T, Инструкция по эксплуатации

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When to replace the battery
When it is time to replace the battery in the transmitter, you will hear
three alternate high pitch tones in the hearing aid. They will be 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
Keep a spare battery on you at all times to ensure your transmitter
always works.