Samsung WEP470 Mode D'emploi page 8

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.
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.
• The headset is not able to operate while charging. Try connecting after
charging is completed.