Ultimaxx Mavic 2 Intelligent Rapid Pro Charger Hub. Can charge 3 batteries at one time and 2 USB devices, ~50-60 minute charge time for batteries and 2A usb output. Dual USB port can output 5V/2A power for Spark/ mavic remote control and smartphone charging, batteries are 13.05V at 13.8A for each channel. Aluminum enclosure provides excellent heat dissipation to prevent over heating Over-voltage, over-current, over temperature protections for consistent and safe operation LED display for voltage and amperage of each charging port.