The straightforward dial control knob allows complete timer control functionality. With watering cycle ranging from 2 minutes up to 120 minutes, one of the 15 preset programs can be chosen to open from as little as 4 times a day to once a week. Timer starts watering at the time program is selected. It requires one 9V alkaline battery (not included). Built-in stainless steel filter traps harmful contaminants and is removable for cleaning. The UV-stable ABS housing is waterproof, and quick-click coupling included allows fast and easy hose removal. Works with operating pressure as low as 7.3 PSI up to 145 PSI; handles maximum water temperature of 104°F and outdoor temperature of 122°F. Reliable solenoid valve designed for smooth water shut off that prevents water hammer impact. Unit is 100% quality controlled during manufacturing process. 2-year warranty. Made in Italy. Should not be exposed at temperature below 37.4°F.