Antlion Detector

The Antlion Detector is a Resistance invention to detect approaching Antlions. Only four Antlion Detectors were ever used, where Sheckley and Griggs were stationed.

The contraption includes three traffic lights, generators and wiring. How it works is very simple. When it detects vibrations, it activates the lights. the more vibration, the more lights. It is not foolproof, however, as both Gordon Freeman and a group of Vortigaunts set it off.