How do I charge the Hellberg Xstream?

Connect the included USB charging cable (B:4) to the headset's charging socket (A8) and a USB power supply — the LED (A11) will flash green while charging and turn solid green when fully charged. Use only a power supply with Output DC 5V 1000 mA (LPS type). A full charge takes approximately 3 hours. All headset functions are automatically switched off during charging for safety reasons. (Page 6)