Take it wherever you go! An audible alarm sounds and a corresponding LED light illuminates accordingly, as lightning strikes at distances of within 6 miles, 6-12 miles, 12-24 miles and 24-40 miles. Indicates if lightning strikes are approaching or moving away. Small and impact resistant, clips to your belt, backpack or golf bag. Low power consumption, up to 100 hours with 2 AAA batteries. Easy to use, simply flip a switch to check lightning strike distance, track storm direction or view battery life.