The Orbit Dual-Dial Hose Faucet Watering Timer allows you to set your watering schedule, and then does the watering for you. With two simple dials, you can effortlessly set how often and how long you want to water for optimal garden and yard health. The digital display shows you the current time, and allows you to set your desired start time. The START INTERVAL dial has ten watering options. Select ONCE for a one-and-done approach, or select to water every 2, 4, 8, or 12 hours. Or select a day interval of daily, every other day, every 3rd day, every 4th day, or once a week. The DURATION dial has eight watering duration options, select from 2, 5, 10, 15, 30, 60, 90, or 120 minutes. The duration dials ON option gives you access to the water without having a time limit. It is easy to install and works with any standard outdoor hose faucet or garden hose.