Sennheiser evolution wireless Série Notice D'emploi page 69

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Battery status indication
The red LED and the lower 8-segment bargraph on the display provide
information on the (remaining) battery capacity.
Bargraph:
The bargraph indicates the (remaining) battery capacity in 3 steps:
8 segments:
4 segments:
1 segment:
Note:
When switching on the transmitter with a partially used battery, it is
possible that all eight segments may show for a short period of time –
if this happens, re-check battery status after a few moments.
LED lit up:
The transmitter is switched on and the battery capacity is sufficient.
LED flashing:
The battery is going flat! You should immediately replace the battery!
the full battery capacity is available,
the battery capacity is sufficient,
the battery is going flat,
immediately replace the battery.