Samsung BHM1600 - Manual (Page 8)

6
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 charger 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.