Samsung ASBH500JRECSTA - Manual (Page 12)

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This headset has a rechargeable internal battery which is non-
removable. Please make sure that you fully charge the battery
before using the headset for the first time.
1 Plug the adapter into the socket on the headset.
2 Plug the adapter into an electrical outlet.
The red indicator light turns on. When the battery is fully
charged, the indicator light changes to blue.
Charging the battery