Originally Posted by Bobby_M
When I went to Greece, I only used a format adapter because the laptop power already accepts from 110-220 as I believe most charging bricks do. Greece is on the two prong round also.
This is a good point. Many electronics accept both 240V and 120V with the flick of a switch. If you think about it from a manufacturing standpoint, it's cheaper to produce electronics this way vs. making two different versions. In some older electronics, the switch can be made internally. I have a piece of studio rack equipment (Digitech GSP-2101) that has a board inside it with a row of holes for a resistor and labels with various voltages (115, 230, etc.). The resistor was in the 115 slot, so I "unsoldered" it and put it in the 230 slot and it worked great in the UK.