This adapter will let you plug into a US 2-prong power adapter in the following locations:American Samoa, Argentina, Australia, China, El Salvador, Fiji, Guatemala, Kiribati, Nauru, New Zealand, Panama, Papua New Guinea, Saint Vincent and the Grenadines, Tajikistan, Tonga, Uruguay— and also the city of Okinawa, Japan.Compatible with all the power adapters Adafruit carries as all are 110-240V compatible!
5V 1A (1000mA) USB port power supply
5V 2A (2000mA) switching power supply
5V 10A switching power supply
9 VDC 1000mA regulated switching power adapter
12 VDC 1000mA regulated switching power adapter
12V 5A switching power supply
Note that this does not contain a transformer, its not going to transform 120VAC to 220VAC, its only a mechanical adapter so its only for use with devices that are OK with 220VAC!