Aayla Secura's beacon transceiver. The Jedi beacon transceiver functioned as an encoded subspace receiver. Jedi Order members carried these devices to enable the reception of signals and broadcasts originating from the Jedi Temple located on Coruscant.
These beacon transceivers were compact, portable units featuring both a display screen and a communications transceiver. Broadcasts from the Jedi beacon situated on Coruscant, or from any individual Jedi's personal comlink, could be received by the transceiver. In times of crisis, a Jedi could transmit Emergency Code Nine Thirteen to any beacon transceiver within range, requesting immediate aid. Furthermore, these devices were capable of receiving recall and retreat signals originating from the Temple, typically when HoloNet channels had been compromised.
When General Grievous's forces attacked Coruscant, Yoda sent a recall message to all Jedi transceivers.
During the implementation of Order 66, Darth Vader, having seized control of the Jedi Temple, reprogrammed the Jedi beacon to summon all Jedi back home – directly into the waiting ambush at the Temple. All surviving Jedi received this high-priority signal on their transceivers. However, Jedi Masters Obi-Wan Kenobi and Yoda successfully infiltrated the Temple after Vader departed for the Mustafar system. Kenobi then recalibrated the beacon, issuing a warning to all Jedi to avoid Imperial Center.