Yes and No! Some countries use the same frequencies as we do. Some countries use K band combined with other bands not used here. Before bringing a detector overseas you need to first determine what frequencies are used in that country.
Just a word of warning for those overseas planning on visiting the USA. While visiting, you may want to purchase a radar detector over here but be careful. Some retailers may mark an inexpensive unit and say that they are "Euro Ready" or "Retuned for European radar". Whistler does not sell European units in the USA, nor do we "retune" them for sale in the USA. We have overseas distributors to handle these types of sales. As most consumer advocates warn - "buyer beware".