"CHG" indicates charging. Input : DC 5V 2A (Micro USB/Type-C). AAA 800-1100mAh: 0.8-1.2 hours. AA 2300-2800mAh: 2.5-3 hours. 1 x USB Port. 【 LCD Display】. Every Slot has its own cycle, you will never worry about having to find two Low-power batteries for charging.