TENERGY T-1000 Ultra Fast Dual Use Charger for Indoor and Inside Car Use for AA and AAA batteries Recharges 2 or 4 pieces Size AAA, AA Ni-MH & Ni-Cd batteries in 2-3 hours Negative Delta V Cut off feature to 100% protect your batteries Great deal on a fast charger for both in house and travel charging Includes "intelligent" microprocessor controlled charging, identifies defective cells and a safety timer for complete overcharge protection With mechanical design against wrong polarity and short circuit protection