A slim, faster charger with intelligent safety and technical features that charges up to four AA or AAA batteries at the same time. The sturdy cassette also serves as a battery holder, in which the batteries can be stored securely.The complete charging of 2 batteries takes slightly more than 2 hours; for 4 batteries it takes slightly more than 4 hours (AA batteries 2100mAh), power is supplied via a USB-connection. The two-color LED display shows the charge status and indicates whether disposable or bad batteries were inserted. New with this charger is the function ""Battery status check". With this function, you can quickly and easily check whether your batteries are still sufficiently charged or need to be recharged. You can thus avoid unexpected situations with flat batteries and avoid unnecessary charging of your batteries.Further safety details are the automatic power-off timer and the DV full charge detection, which help to prevent overloading, over-voltage and short-circuits as w