CS50/CS60-USB: Optional AC Power Supply
The CS50/CS60-USB gets its power from the USB port on the computer itself, once the computer gets turned off the unit is no longer getting power. So if your computer stays on all the time there is no need for the AC power supply. But if you have the power supply plugged in and turn the computer off the AC power will continue to charge the headset so the next time you go to use it will be fully charged and have power.
64401-01 - AC Adaptor (US & Canada)
66804-01 - AC Adapter (Australia / New Zealand)