A compact charging unit with intelligent safety and technical features that simultaneously charge up to 4 AA or AAA batteries. The robust housing also serves as a battery holder, by which your batteries are well protected at home or while traveling.In 3 hours, the device charges 4 850 mAh AAA rechargeable batteries via a USB port. The charging progress can be tracked via the LED display. It shows the charging status as well as 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.Other safety features include automatic power-cut timer and DV full charge detection to help prevent overcharging, over-voltage and short circuits, and battery life degradation. This versatile battery charger work