Energizer Recharge Pro Charger - With a name like Pro Charger, you know you can expect high-performance charging - and great savings over disposable batteries. Paired with long-lasting NiMH Energizer Recharge batteries, you can charge 2 or 4 AA or AAA NiMH batteries in just 3 hours. Features Charges 2 or 4 AA or AAA NiMH rechargeable batteries Overcharge protection prevents damage from overcharging Provides Audio and Visual alerts