Orbit Watermaster 57880 Four-Station Super Dial Indoor/Outdoor Mount Underground Sprinkler System Timer Two Independent Programs - Days of Week, Watering Intervals or Odd/Even Days Compatible - Works with new and existing sprinkler systems Manual Rain Delay - Settings for 24, 48, and 72 hours Easy to Program, Easy to Use - Large buttons and easy to read LCD Rain Sensor Ready. Optional Rain Sensor automatically prevents sprinkler system from watering during a storm.