The power supply is dual voltage, all you would need is a US-European plug adapter like this: http://www.amazon.com/CVID-Grounded-European-Adapter-Adaptor/dp/B0098B5GN8/ref=sr_1_5?ie=UTF8&qid=1382032929&sr=8-5&keywords=us+to+european+plug+adapter
A little over a year ago we purchased three of these for business to run videos on a loop. They work very well for us. You do have to make sure the definition or size of the video is not too large or it will not run but other than that they work very well.
The specific answers to these questions are unknown to me. Anything and everything this product has to offer is described AT LENGTH on the website; keep scrolling down. If this is not helpful, the manufacturer is your next best bet.
I put about 10 different folders of photos on a flash drive. Also some mp3 music. I believe it cycles through each folder in alphabetical order. If you don't want to listen to the music, just turn the volume down. Set it to turn off automatically at a specific time so that you don't have to remember to turn it off