Vortex manipulator

The Time Agency used wrist straps for a variety for functions. According to the Time Agent John Hart, Time Agents would bicker over the size of their respective wrist straps.

Functions

 * Vortex manipulation to facilitate time travel (DW: Utopia, The Sound of Drums)
 * Communication between users, including storage of messages (TW: Kiss Kiss, Bang Bang)
 * Projection of holograms (TW: Kiss Kiss, Bang Bang, Fragments)
 * Teleportation (DW: The Sound of Drums, Last of the Time Lords, The Stolen Earth)
 * Tracking of life signs (DW: Journey's End, Bad Wolf (TV story))