Prior to first use, the Plantronics Discovery 610 headset must be charged for a minimum of 1 hour; 3 hours for full charge. An A/C power adaptor is included. The headset status indicator glows red during charging and turns off when fully charged. Caution: Do not use the headset while charging and do not connect the charger while it is in use. Using the Included A/C Power Adaptor Plug the A/C power adaptor into the base of the headset and connect it to your power source.