The Infapower 4 Channel Universal Battery USB Home Charger can be used worldwide. It will charge 1, 2, 3 or 4 AA or AAA batteries at a time. LEDs show which batteries are being charged. Micro USB cable included. Features include Worldwide use with USB plug (not included), Reverse polarity, bad cell and short circuit protection. No batteries included. It will charge any brand of rechargeable batteries. Charging Times AA 1300mAh: 8 Hours AA 2500mAh: 14 Hours AAA 650mAh: 10 Hours AAA 1000mAh: 15 Hours