The adapter in the box charges the iPad over USB 2.0. Apparently if you want to plug it into the wall, you need to purchase the accessory. I have an old iPhone wall charger. I'm thinking it will work...?Yes.
In the box
iPad
Dock Connector to USB Cable
10W USB Power Adapter
Documentation
But apparently 10W USB Power Adapter is just like the one I already have for my iPhone??