100-240 VAC, 50/60 Hz Voltage Charge Two USB Devices At Once 3.1A Total Power Output 1 x USB Type-A, 5V/2.1A Output With the GA-7200W 15.5W Dual USB AC Adapter from Gigastone, you can charge up to two mobile devices simultaneously. This 100/240 dual-voltage adapter features two USB Type-A ports, with one port providing up to 5V/2.1A of charging power, and the other delivering 5V/1A.