Samsung HM1800 - Manual (Page 9)

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English
Never make or receive calls while charging, always disconnect your headset •
from the charger and answer the call.
To save energy, unplug the travel adapter when not in use. The travel adapter
•
does not have a power switch, so you must unplug it from the outlet when
not in use to avoid wasting power. The travel adapter should remain close to
the socket when in use.
Checking the battery level
To check the battery level, press and hold the Volume down button and the Talk
button at the same time. Depending on the battery level, the indicator light flashes 5
times in one of the following colours:
Battery level Indicator light colour
Above 80% Blue
80 ~20% Violet
Below 20% Red