Hi! I am planning to carry my laptop to USA, if finally I fly there. But I don't know if it can work properly in USA. Although in the transformer it says "50-60Hz", I am not sure. Have you got any problem those who usually travel from Europe to USA?. Also, I don't know exactly how are the electrical plugs and sockets in USA. My plug has two connections. I heard that USA ones have three. Is it true? Thanks.