Microtech Radius CIC Operation Manual page 9

BATTERIES
Low Battery Indicator
Your hearing professional will check the box below
if the low battery indicator for your instruments is
turned on.
The low battery indicator is turned on.
When the low battery indicator is turned on, your
hearing instruments will beep four times going from
a high-to-low pitch when the battery's voltage is low.
Replace the battery when you hear these tones.
When the battery is too weak to power the hearing
instrument, you will hear a tone for two seconds and
the instrument will shut down. Replace the battery
when this happens.
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