It's easy to use. Simply press the green button to start the program, then the red button when watering is sufficient. Pratico memorises the time that has elapsed between the two operations and repeats the program (maximum duration 60 minutes) at the same time every day. A led indicates all programming phases and can display the times you have set at any moment. You can also set the watering times with a simple pulse code using the same two buttons and the led. The unit is fitted with a washable stainless steel filter. It runs off a single 9 V alkaline battery which lasts the entire season. The electronic components are perfectly sealed. Operating water pressure from 0,1 to 12 bar. Fully checked and tested.