The Duracell Value Charger is a simple and budget-friendly way to be green. Up to 4 'AA' or 'AAA' NiMH rechargeable batteries can be charged at one time using the Value Charger; in 6 hours all the batteries will be ready to power your devices once again. Charging automatically stops on its own when the batteries are full, preventing overcharging. When storing the charger, or traveling, the wall plug folds down for convenience. The unit comes conveniently bundled with 4 AA batteries. It runs on 100-240VAC power, enabling use all over the world.