If you worried about power supply/voltage/plug in europe countries, then i suggest to get a multi adapter. I bought a multi adapter by targus at SLS which cost me about $35 - $40. It's a all in 1 plug. So regardless which country i'm in, all i need is to toggle the correct plug selection. Dont have to worry about voltage too. Hasslefree. Hope this is helpful.
i think it will only be wise to get a multi adapter. check when you buy that it can be used in all the countries that you plan to visit. France, Italy and Switzerland use 3 different types of plugs. and all 3 are different from the types you use in singapore.
as far as i know, no. at most they will indicate to you whether it is 220V or 110V from the line. the step up/down part has to be done by your charger which i think most of the chargers nowadays can take both 220V and 110V. Check before you use.