Charges 1 2 3 or 4 AA or AAA NiMH rechargeable batteries at once (4 AA & 4 AAA NiMH batteries included) USB charging port charges NiMH batteries and USB devices simultaneously State-of-the-art charge status LED Lights indicate charge status for each battery Get a full AA charge in as fast as 6 hours with the rapid charging power of Recharge Plus (times may vary by NiMH battery) Auto safety shut-off and overcharge protection features prevent damage from overcharging helping to maximize battery life