Intelligent watering computer: The watering duration ranges from 1 second to 99 minutes and the frequency ranges from 1 hour to 15 days. 3 separate irrigation systems: The configuration of the 3 independent irrigation programs can record your watering schedule, Each irrigation schedule can set a different watering frequency and watering time, allowing you to adjust the watering time more flexibly 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: Manual button allows watering instant and flexible 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 should be used.