The Nitecore USN3 Pro Dual Charger is specially designed to simultaneously charge two Sony NP-FM500H, NP-F730, NP-F750, NP-F770, NP-F970 and NP-F550 li-ion batteries. With a maximum output current of 1200mA per battery slot, two batteries can be fully charged in just 3 hours. The charger operates at 5VDC, making it compatible with USB adapters, power banks, and solar panels. This makes the USN3 Pro ideal for travel, camping and any other adventure. The advanced USN3 Pro features an intelligent charging management system that monitors battery status and displays voltage, charging current, temperature, capacity and level on the LCD screen. The charger automatically selects the most appropriate charging mode based on this data. The device can also monitor battery status, perform health inspection and report cell status as good, normal or bad on the LCD display. So you are always aware of the battery status. The Nitecore USN3 Pro provides mechanical reverse polarity protection, preventing charging if an incompatible or incorrectly installed battery is present. Additionally, the EE error message appears on the LCD screen to alert you if a shorted battery is detected.