Samsung BHM3500 - Manual (Page 8)

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Charging.the.headset
This headset has a rechargeable internal battery which is non-removable.
Ensure that you fully charge the battery before using the headset for the first time.
1 Plug the small end of the travel adapter into the multifunction jack.
2 Plug the large end of the travel adapter into a power outlet. During charging,
the indicator light will turn red. If charging does not begin, unplug the travel
adapter and plug it in again.