Plantronics Explorer 390 User Guide - Page 6

Charging Your Headset 1 2 Charging time 2 hours Full charge 20 minutes Minimum charge before first use How to Charge Your Headset Using the AC Charger Before using your headset for the first time, charge it for at least 20 minutes. A full charge takes approximately two hours. 1 Plug the AC charger into a power outlet. 2 Connect the charger cable to the charging jack on the headset. While your headset is charging, the indicator glows red. When your headset is fully charged, the indicator turns off. Note This headset is protected from being charged at extremes of temperature. Only charge within the specified operating temperature range. Warning Do not use your headset while it is connected to the charger. 2