Samsung BHF1000 - Manual (Page 8)

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2.
Plug the large end of the cigar lighter adapter into the accessory outlet in your
vehicle.
3.
When the battery is fully charged (the indicator light turns blue), unplug the
cigar lighter adapter from the hands-free car kit.
You can also use the travel adapter to charge the hands-free car kit. •
About the low battery indicator •
When your battery is low, the indicator light will turn red. Recharge your battery
to continue using your hands-free car kit. If the battery level becomes too low,
the hands-free car kit will automatically power off. To turn it on, slide the Power
switch up again.
Checking the battery level
Press and hold the Talk button and the Volume down 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