I can't claim to have personally tried every single outlet in Europe, but I can tell you that the majority of European plugs are recessed: that is, the actual socket into which the plug prongs go is set into a little round hole about half an inch deep. This adapter does not fit into that recess, and is therefore useless. I found this out the hard way in both Holland and the Czech Republic, and great was the wailing and lamentation on both occasions.
You can use this with an extender built for the purpose (see the Simran Plug Adapter on this site for an example), but if you're doing that, why not just get an adapter that fits in the first place? All-in-One Travel Power Plug Adapter for US, UK, EU, AU
I just got back from 10 days in France and Italy. Of the three of us on the trip, mine was the only adapter to work. It did a great job on plugs for the iPhone, hair dryer, flat iron, camera batteries and that was all we took with us.
What a lot of people don't realize is most of your modern stuff does not need a converter (plus this adapter). So we just used the adapter and all our stuff was rated for both US and EU use. Look on your equipment for 100 or 110V-240V, 50-60Hertz, if it says this it will work in the US and Europe.
I was visiting India and Europe. I had the choice of purchasing multiple batteries or this for my dSLR. Clearly, this was a wiser decision. The product feels a little flimsy, however, it works as described. I was able to charge my camera's batteries in India, Paris, Brussels and Venice. There were absolutely no issues. My brother borrowed it to run his laptop and reported no problems with it. It is also pretty cheap for its performance.
I have been living in Korea and needed a good adapter so that I could use my American electronics without using the bulky transformer boxes (almost all my gear has built in transformers, so I only needed an adapter). However, I found that when using the European setting, even the slightest nudge would cause it to lose connectivity. I even went as far as trying to tightly tape it into place, but it would still only hold for a few seconds.
in addition, when I first plugged it in and occasionally later on, it would make loud sparks. There are even scorch marks on it and the American surge protector I was trying to use with it. I've been reading more now, and realize that cheap adapters are very unwise in Korea and can cause fires.
my advice is to find a much more reliable adapter, especially if you're going to be using it in Korea.
I tried to use this all-in-one adapter on my recent trip to multiple cities in Europe. But, the coupling (connection) was loose in every socket, and hence I spent a lot of time trying to get this adapter to fit. Hence, I'd recommend against buying this adapter.
Luckily, I had also bought dedicated adapters for each country, and those worked extremely well. Here is the list for anyone who intends to travel to Europe.
x Lewis N. Clark Grounded Italy Adapter Plug - Italy only
x Power Bright PB-12 US to UK 3-Prong Travel Outlet Plug Adapter - UK only
x Grounded Adapter - CE Certified - USA to Europe - Heavy Duty Adapter - Most places in Europe
And, a power strip to connect multiple US style outlets
x Monster MP OTG400 BK Outlets To Go 4 Outlet Travel Power Strip (Black) - International - Universal Adapter - Converter - Power Plug Adapter'
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