Blazer M847 Strike Alert HD - Lightening Detector 4955 Description: Presenting the next generation of personal lightning detection...exclusive 360 detection in all directions. The first detector with a graphical display that shows you the lightning strike distance (from 0-40 miles away) as well as a 1-hour storm trend and intensity. Visually see the lightning strike distance and the 1-hour storm trend. 360 Lightning Detection: Unlike other lightning detectors, Strike Alert HD tracks light-ning in ALL directions - no blind spots. An audible and/or vibrate warning alerts you before (and while) lightning is within striking distance. LED indicators light accordingly at lightning distances of 24-40 miles, 12-24 miles, 6-12 miles and within 6 miles. Low Power consumption: Up to 80 hours of operation. 1-Year Factory Warranty on Detector. 2-AA Batteries (included).