Unlike other systems that are based on distance, Thor Guard systems are based on time. Model L75 gives a red-alert warning 8 to 20 minutes in advance of a potential strike, allowing golfers on the course to seek appropriate shelter. Entry-level base prediction and warning system control center is available as automatic or manual, capable of providing audible and visual warning for a single site. Connects to Thor PC visual display and storm storage software. Unit is fully upgradable to provide warning for remote locations up to 114 miles away. Thor Guard Inc., Sunrise, Fla.