You guys had to keep talking about this until you forced me to go look at my user's manual....

I note that the AC Adapter that came with my Dell laptop is rated for input of 90 to 135 VAC and 164 to 264 VAC, at 47 to 63 Hz with no modification, and not even any switches to flip. Just snap on a "socket adaptor" and plug in almost anywhere in the world. Regardless of what you put in, you get 20V DC out. Not too bad for a $50 (US) power adjuster/regulator. IF YOURS IS THE SAME, you don't have to worry about whether you've got a US (120V 60 Hz) inverter or a euro (230V 50Hz) inverter - just plug in and go.

I did come across some comments that may be worth noting. I found a rather disturbing batch of complaints about laptop external power sockets in general. It seems that many of these are connected directly to the motherboard so if you damage the socket you replace the board. Expensive. It also appears that it's common that the board is the only (or at least the primary) physical support for the socket, so some of them are very fragile - at least compared to what you'd expect in a "portable" device.

Some manufacturers seem to assume that if you're on AC power you're at a desk, and recommend that you unplug all external devices before you even slide the computer around on the desktop. I don't think I care much for that attitude, but it appears that many laptops are designed and built so that one should "observe the warnings."

John