With the Patona Dual LCD USB Charger for Panasonic BLF19E DMWBLF19 DMW-BLF19, you can quickly charge two batteries simultaneously and independently of each other. It doesn't matter if the two batteries have the same capacity. Additionally, the charger features a USB output, allowing you to charge third-party devices at the same time. The integrated microcontroller-controlled charging technology automatically detects the required voltage of the inserted battery and prevents overcharging or overheating. The charger offers two charging modes: "L" for normal, battery-friendly charging and "H" for fast charging. Important information such as the charging status, active USB port, use of the car adapter, and charging mode is displayed on the LCD screen.