holman two dial timers can run on 2,5,10/15,20,30,60,120,mins on the 2nd dial its 6hrs , 12hrs 24hrs, 48hrs, 3rd day/4thday/5th day/7th day@ upto 4 cycles per day and upto 7 days per week so if i set it on the 1 dial to 5mins and the 2 dial onto 3rd day it will auto turn on and off after 5mins every 3rd day or..if set to 2 mins on 1st dial and 6hrs on 2nd dial it will turn on/off every 6 hrs for 2 mins thats why i attached a tap to the hose to regulate the amount of water flowing through the timer go to www. holmanindustries.com.au you cant direct link from this site though or google bunnings warehouse for pics locate at tap timers $23 cheapest around and great for tomatoes