Edwards EST SIGA OSCD Smoke and Carbon Monoxide (CO) Detector Edwards Signaling 711U 2 Wire Smoke Detector 12 24Vdc Edwards Siga Oscd Smoke and Carbon Monoxide Detector This may look like a regular smoke detector, but it's actually a vape sensor. Columbus County Schools now has these sensors in high school bathrooms, an effort to keep kids from vaping. Edwards EST SIGA PS Intelligent Photoelectric Smoke Detector Vape Detector vs. Smoke Detector: Comparison & How They Work