This Italian-made timer combines versatility and simplicity: only 2 dials (frequency and duration) to select any of the 68 programming options. Frequency options: every 8, 12, 24 hours and every 2, 3, 5, 7 days. Watering duration options: 1, 2, 3, 4, 5, 10, 15, 30, 60 minutes. Timer starts watering at the time program is selected; no programming in advance. A 5 minute preset manual override allows to water between cycles or to stop programs without altering them. Requires 1 9v alkaline battery (not included). LED indicator shows status of timer operation and battery power. Built-in stainless steel filter traps harmful contaminants. Quick-click coupling included for fast and easy hose removal. Works with operating pressure from 7.3 PSI up to 145 PSI, maximum water temperature of 104 Degree Fahrenheit and outdoor temperature of 122 Degree Fahrenheit. Reliable solenoid valve designed for smooth water shut off that prevents water hammer impact on piping. Unit is 100% quality controlled during manufacturing. Do not expose at temperature below 37.4 Degree Fahrenheit.