Intelligent watering computer: The irrigation duration varies from 1 second to 99 minutes and the frequency from 1 hour to 15 days. 3 separate irrigation systems: Setting up the 3 independent irrigation schedules can save your watering schedule, Each irrigation schedule can set different watering frequency and watering time, allowing you to adjust the watering time more fleible and better meet your needs. Automatic rain sensor: The top of the smart timer is equipped with a rain sensor chip. When the chip comes in contact with rain, it will automatically delay watering until there is no more water on the chip. Manual irrigation and child lock: The manual button allows for instant, flexible watering without interrupting your set watering schedule. Child Lock can lock the timer can avoid accidentally changing the programmed setting. Special attention: lithium batteries are prohibited. Two 1.5 V alkaline batteries must be used.