Stones

Stones are items that every student and teacher within Crossroads have. They are small, smooth, spherical items that can fit in the palm of your hand, and their color varies from person to person. While that's not their real name, most everyone simply refers to them as "Stones" due to their resemblance to rocks. Whether they work by magic or are extremely high-tech gadgets is very hard to tell.

=Features=

Keys
Stones function as a student's dorm room key. To enter the dorm room, the student swipes the stone over a scanner under the doorknob, and it unlocks the door. Obviously, the Stones are coded to relay which student they belong to, which leads to the next function...

IDs
Stones are effectively a student or teacher ID, based on how they work. Stones are specially made so that they work ONLY for the person they belong to, so stealing someone else's Stone won't allow you to access areas that only that person can go to.

Debit Cards
All of a person's in-school currency is stored within their Stone, so that the Stone can be used as basically a Debit Card of sorts. A voiced activated holo screen that can pop up from the Stone can show how much money you have.

Phones
The Stones also function as phones (since actual Cell Phones don't get any service at the school), allowing the user to talk to another person through a video phone function through the holo screen, and also can send text messages, which the stones even project a hologram keyboard for typing them up.