Samsung BHM3100 - Manual (Page 9)

English
5 When the headset is fully charged, the indicator light changes to blue. Unplug
the travel adapter from the power outlet and remove the headset from the
charging cradle.
Use only a Samsung-approved travel adapter. Unauthorised travel adapters may
cause an explosion or damage to the headset.
The battery will gradually wear out while charging or discharging because it is
a consumable part.
While charging, the headset goes into charging mode and deactivates other
functions.
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When.the.battery.charge.gets.low
The headset beeps and the indicator light flashes red. Recharge the battery. If the
headset powers off during a call, the call will be automatically transferred to the
phone.