A high-frequency transmitter served as a communication tool installed on probe droids under the orders of Emperor Palpatine. These transmitters enabled probe droids to immediately send the information they gathered back to the Galactic Empire, ensuring there was no lag in the data obtained by the droid.
- Galaxy Guide 3: The Empire Strikes Back
- Galaxy Guide 3: The Empire Strikes Back, Second Edition (as high frequency HoloNet transceiver)