What's This? Can you help?

[piaabro210]

Hey take a look at these 2 scanned in pictures I took. I have no idea what this item does for my X5. It was given to me at delivery and didn't think much of it until here recently when I was finally trying to figure out what it was. I can't find any information on it and the owner’s manual mentions nothing of it. It seems to be some sort of access key to something. Does the X5 have some hidden lock box that I need this for?

On the bottom it has the following web address www.ibutton.com. On the black part of this thing it was the words "GE Supra" and on the border it states "Do Not Duplicate."

What is this? Thanks for your help,