[ehmuidifici]

That's the one of coolest things in Disney World and worth the extra money you'll pay for that (about US$ 14). It's really impressive how does it work and how it gets connected to other services, like restaurant reservations, 'fast-pass' and memory maker management.

[joezydeco]

At the moment it's free if you stay on the property in one of the resorts. It also acts as your room key.