Introducing the LiftMaster SOS 12 Siren-Operated Sensor Emergency Access Vehicle Detector, your reliable solution for seamless emergency access. This innovative device recognizes the "Yelp" siren within three seconds, triggering your gate to open effortlessly. Designed with cost-effectiveness in mind, it allows emergency responders to access your property without the hassle of stopping or using keys. The package includes the SOS XII Siren Operated Sensor, a reflective sign, and a CD recording of the "Yelp" siren. With a discreet NEMA 4 enclosure and enhanced protection features, this system ensures that all gates are 911 accessible. Upgrade your security today and ensure peace of mind for you and your loved ones!