Welcome and congratulations.
I'm sure the info is here somewhere but this is what I cut and pasted from CNET (first result when googling "2006 BMW X5 premium package":
The Premium Package ($2,500) adds a huge power moonroof, autodimming mirrors, and a power-adjustable rear seat back, as well as the BMW Assist system, which includes Bluetooth integration, roadside assistance, vehicle service notifications, and emergency calling services.

Scott