The ProMaster Speed Charger 1000 is fast, reliable, and easy to use. It includes 4 high capacity 2700mAh NiMH Speed Cells in a protective case. An LCD panel conveniently shows the charged capacity of the cells. It can recharge either AA or AAA cells 2 at a time or 4 at a time. Output Power: 1000mA Input Power: 100-240 VAC, 50 60 Hz Charge Time: 3 hours (using included 2700mAh Speed Cells) Charge Current Control: Negative Delta V