It has my pass/tickets (annual pass, event tickets, etc.) saved to it as well as my FP+ reservations which is essentially a reservation to go to the front of the line on rides. We get to reserve 3 rides and times for each day 60 days out because we are staying on Disney property. Public can reserve them 30 days out. You just hold it up to a sensor and you get into stuff.
I don't know but I'd check its value on eBay first