If you have to use it frequently I would recommend just getting the European charger: http://store.apple.com/de/product/MD813ZM/A/apple-usb-power-adapter?fnode=

If you have to use it frequently I would recommend just getting the European charger: http://store.apple.com/de/product/MD813ZM/A/apple-usb-power-adapter?fnode=48 http://store.apple.com/de/product/MD813ZM/A/apple-usb-power-... (Yeah, Apple doesn’t do prices below €20, but it’s a pretty nice and compact charger. It’s longer than the US charger, but very flat, which I think is a better form factor in many situations.) All of this is to say that these adaptors are super annoying, look ugly, add bulk and are easy to forget, so never an ideal solution.