I understand you are looking for a European Power supply for the Slingbox Pro. If you got to Support.slingbox.com and Click on the Flag, in the top right-hand corner of your page, you will get the option to Change your Location. You may then Select the Country in Europe you are in and purchase the power supply with the proper specs from there. To save you some time, I went ahead and did this for you with United Kingdom Support, just click the link below to see the power supply's available in that area:
Hoe this helps!