It was an early-warning system using infrared motion trackers to give an audio or visual alarm. It was default to audio but it could be configured to sound only inside a blast helmet, or to be only inner visual. It had a range of 30 meters and it was activated should a mass of over 10 kilograms was found traveling in the radio faster than 1 meter per second, which was understood as an attack.
- Galaxy Guide 10: Bounty Hunters (First mentioned)
- Cynabar's Fantastic Technology: Droids (As "motion sensor array")
- Gundark's Fantastic Technology: Personal Gear