The VARTA LCD Plug Charger plus is equipped with 4x AA 2100 mAh batteries and can charge AA/AAA/9V batteries and a USB device at the same time. The comprehensive safety features include: Minus Delta U shutdown, short circuit protection, detection of alkaline and defective cells and a safety timer. The intuitive LCD display that shows the charge level, combined with the ability to charge 9V batteries and USB devices, completes the practical LCD Plug Charger plus and makes it your reliable charger for all your batteries.