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Pro Easy to use because it's color coordinated
The compact, well design box that the adapter comes in gives you a list of which countries use what block of the adapter. The lists aren't complete, but you can find the complete map on their website.
Pro Very compact and lightweight
It's a lightweight adapter that takes up very little space thanks to its creative lego-like design. Great option for backpackers who are worried about weight/bulk.
Pro Very little risk of losing pieces
Where some adapters come is 6 or 7 different pieces, this adapter quickly fits together into a block. You'll know right away if a piece is missing.
Well made adapter that is built to last.
Con Flaps covering the pin holes can be stubborn
There are flaps inside the adapter which get pushed out of the way when you plug something into it. However they can be very stiff.