Samsung BHM1600 - Manual (Page 9)

English
3 When the headset is fully charged, the indicator light changes to blue. Unplug
the travel adapter from the power outlet and the headset.
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.
When a call comes in while charging, disconnect your headset from the travel
adapter and answer the call.
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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.