Sling Catcher True Resolution in Streaming

[slingboxinla 0]

If any videophile here can comment exactly what the slingcatcher's resolution is when streaming from a slingbox PRO HD. The website is saying this

""" Yes, you can stream higher definition video from your PRO-HD to a SlingCatcher. While it's not true HD, it's higher quality than standard definition."""" So if it is not True HD and is better than SD? Does anyone know what resolution this is?