I got one of these yesterday, it wasn't clear from the photos on the IKEA site but it's a pretty neat device because the power socket part is actually separate from the repeater part.
So you have the power socket (5V USB) and then a USB repeater which plugs in to the USB on the power socket and also passes through the USB power, if that makes sense.
It means you don't have to use it with the power socket itself, any 5V USB power supply would be fine. I plugged mine into a convenient USB port on the back of a TV screen (one that doesn't lose power when the screen is on standby) using a USB extension lead to position it in a good location.
