The VARTA LCD Smart Charger plus is equipped with 4x AA 2100mAh batteries and can charge up to 4 AA/AAA batteries. In addition to the 2 modes of charging and refreshing, the charger has a single slot charge and a trickle charge. The comprehensive safety functions include: Minus Delta U shutdown, short circuit protection, detection of incorrectly inserted cells, detection of incorrect or defective cells, safety timer and temperature control. The intuitive LC display, which shows the charge level, and the option to charge USB devices complete the LCD Smart Charger plus and make it your reliable charger for all your batteries.