Toro 53805 Lawn Master II 4-Zone Landscape Sprinkler System Water Timer 3 Independent watering programs and up to 3 start times per program, with adjustable watering times ranging from 1 minute to 6 hours 365 Day calendar water on specific days of the week, odd or even days or day interval, with day exclusion to meet water restrictions Perfect for traditional and dip irrigation; seasonal adjust - easily adjust run times as weather or seasons change Three modes of operation - automatic, manual station and manual program Battery back-up stores programming (9-volt battery needed)