MELASTA 3 in 1 Super Quick 2 Solt Battery Charger Multi-Protection AC 100-240V Chargers with Smart LCD Display for AA/AAA / 9V Ni-MH/Ni-CD Rechargeable Household Batteries Multi-function: it can be used to charge AA battery as well as AAA battery , in the middle of the charger, even great for charging 9V battery! Smart: auto switching to a trickle current to maintain the highest charge possible. LCD display screen : reports the individual charge levels of each cell, preventing energy wastage, making your life a little bit easier. Multi-protection: overloading protection, overheat protection, overcurrent protection and short circuiting protection. Energy and Money saving: reused rechargeable AA/AAA/9V battery just by ONE charger, you are protecting the environment while save the money of buy 2 chargers.