The BESTON AA / AAA 8 BAY : 1.5V LI-ON CHARGER is suitable for charging AA/AAA Li-ion Rechargeable Batteries. 8 x batteries may be charged simultaneously, saving time. The Charger has LED indicator lights which glow either Red or Green. A Red constant light indicates the batteries are busy charging, Green indicates the batteries are fully charged and ready for use. A flashing Red light indicates an error possibly the batteries are not rechargeable.