The Hozelock AC1 water timer is simple to use and perfect for quickly automating garden watering systems. Using a single dial for programming, this water timer offers a choice of thirteen pre-set programs to water your garden. Programs range from four watering cycles per day to once per week. This fits directly on to a standard outside garden tap with either a 1", 3/4" or 1/2" BSP thread size. This is a battery powered water timer using 2 x C size batteries. The batteries are sufficient to last an entire season.