I bought this adapter after a friend lent me his, identical. I am very happy. It combines taken US, UK and EU, all in a relatively compact package. As such, it has taken the UK. When opened - easily - we get the US decision. And the small European plug, on which you can connect devices US, lies between. The UK dose in combination with the rest of the adapter, used for a European device. But separated from her half, it serves for a US unit. In sum, there is therefore a EU adapter to UK and US, but also from a US to UK and EU adapter. The big plus of this adapter: besides being able to plug a European plug, you can simultaneously connect a second device via USB.