Hyperspace transponder

A hyperspace transponder was a device that allowed messages to be sent through hyperspace. Some transponders were built small enough that they became handheld devices. Hyperspace transponders were not always reliable in sending messages.

Jedi Master Mara Jade Skywalker used at least two hyperspace transponders in her lifetime; one she used as a homing beacon during her time as Emperor's Hand (this transponder was hidden in a vibroblade that she bequeathed to her son and was promptly utilized as a tracking device afterward) and the other she used to track Lumiya after their vicious lightsaber duel on the moon of Hesperidium.