The Eartec 10-Port Multi-Charger with US Plug features 10 bays to recharge the batteries for UltraLITE, UltraPAK, and HUB. When the batteries reach full charge, the corresponding LED turns from red to green, indicating that the battery is charged up and ready to go. The use of external batteries allows users to keep their systems up and running with minimal down time. The charge time is approximately three hours. The charging base ships with an AC adapter with a US plug.