Samsung HM1500 Mode D'emploi page 11

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Checking the battery level
At the same time, press and hold the Volume up and down buttons.
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
Wearing the headset
Insert the earpiece in your ear and clip the headset
to your clothes.
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