The Rayovac Platinum Universal Charger plugs into a standard wall outlet (100 - 240V) and can charge up to eight AAA, AA, C, D and/or one 9V Nickel Metal Hydride (NiMH) or rechargeable nickel cadmium (NiCd) batteries. Has three LED lights on the charger that indicate batteries have been correctly loaded and charging current is being delivered. The LEDs will shut offwhen charging is complete. Current will stop flowing to batteries at this time. The Charger has a backup timer that automatically stops charging the batteries after 8-1/2 hours Can recharge your AA NiMH rechargeable batteries in4 to 8 hours. Charging times are based on the mAh, or capacity, of the rechargeable battery.