[Source] The Jedi beacon was a device housed within the Jedi Temple's central security station that served as a means of contact for all Jedi throughout the galaxy. Its typical purpose was to be programmed with a signal that could alert all Jedi to return home to Coruscant. In its simplest form, it consisted of a basic alert signal that was a steady pinging noise. There were also other components, which could send detailed text and holographic messages.