Intelligent watering computer: The watering duration ranges from 1 second to 99 minutes, and the frequency can be set from 1 hour to 15 days. Three separate irrigation systems: Configure three independent irrigation schedules to customize your watering plan. Each schedule allows different watering frequencies and durations, offering flexible adjustment to meet specific needs. Automatic rain sensor: The smart timer features a built-in rain sensor. When rain is detected, watering is automatically delayed until conditions are dry. Manual irrigation and child lock: A manual watering button enables immediate watering without disrupting the programmed schedule. The child lock function prevents accidental changes to settings. Note: Lithium batteries are not supported. Use two 1.5 V alkaline batteries only.