If you've got an area to block off or are in need of assistance on the roadway, this safety flasher will get the necessary attention. The unbreakable disc has 9 different flash patterns, from subtle to screaming, and 16 super-bright LED lights for 360° visibility. Operates in temps ranging from -40° to 212°F, and can be seen from 1000 feet away in daylight, 3000 feet away at night. Waterproof, floatable, non-flammable, powerfully magnetic (the Germans mount it on top of patrol cars). CR123A battery can run continuously for 60 hours; remains good for 10 years, even if dormant.