The Battery Operated Sprinkler Timer with Valve is great for repairing or retrofitting an existing sprinkler system, or installing new systems in areas where no power exists, such as fields or pastures. One set of standard batteries provides up to a year of automatic operation, and has a low battery sensor to warn when fresh batteries are required. The timer offers two programs (A and B) for multiple setting options. Installation is simple, and programming is straightforward and easy to understand. Compatible with a rain sensor to create a rain delay in programming.