Invented in 2084 IC, Clan Skryre warlocks perfected a device dubbed the Farsqueaker, which allows for instantaneous communication between warrens any distance apart.[1a] Indeed, they allow the Council of Thirteen to communicate with its agents in the field.[1b]
A given farsqueaker is a handheld device that allows for two-way communication, though the farther away - the more interference the transmitted signal has.[1c]