Usb adaptor product details designed for foreign travellers visiting the americas this non earthed transworld travel adaptor twin usb charger converts the most common 2 and 3 pin blade plugs to the american electrical system the convenient 39twisting39 pins allow the adaptor to be used in australia too the double usb ports have a combined auto regulating power output of 13a ideal for charging small electrical devices such as a smartphone or an mp3 player