Hello Hinghing,That's the Slingbox AV. It uses the same adapter as the Sling TUNER and CLASSIC. Here's a link verifying this at the Sling store:Here's a link to the AVs support page (some documentation can be found here):From the Sling Classic's manual (uses same adapter), here are the power supply specs:
I'm not sure about the polarity though, which is very important. Other Slingbox models use tip-positive polarity but that's no guarantee this one does. If you find your own power supply and get the polarity backwards, you'll probably destroy your Slingbox.
Hope this helps,