I think all of our hair dryers are double insulated but they also add an immersion detector so it will trip out if you drop it in the tub.
OK, that does make sense. That might be the next thing we'll see here, we do get the occasional fatality with hairdryers (and shavers) in the bath. I haven't heard any talk about that though, the Germans are busy introducing AFCIs at the moment (not mandatory yet).
Anything with an SMPS inside will be wide-range 100-240 V these days, some computers have been for decades, especially laptops. IBM-compatible Desktop systems usually had a slider switch, Apple used wide-range power supplies very early on. CRTs were usually single-voltage though. Wire-wound transformer power supplies are pretty much extinct these days so the voltage issue is mostly limited to anything with mains-voltage AC motors in it, as is 50 vs. 60 Hz.
