This timer is very easy to programme. Just three buttons are used and a large digital display shows what you've programmed. You can set two watering cycles per day and watering cycles can be between 1 minute up to 23 hours 59 minutes. You can set watering cycles per week. Omitting the days on which you don't want to water. The timer runs off one 9 V battery (not included) which can power the timer for an entire season.