This promotional Duo USB to AC Adapter is a devices, which allows you to charge your USB powered devices through this compact duo USB to AC adapter. It fits standard American 2-prong AC outlets. It is suitable for prongs fold for storage and travel. It can be charge time varies by device. The following is power, input is AC 100~240V /50-60Hz 0.50A; output is DC 5V 3.4A.