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)
- Teleportation (DW: The Sound of Drums, Last of the Time Lords, The Stolen Earth)