The Pro Flo Metal Mechanical Hose Timer works just like an egg timer, making it one of the quickest and easiest to use. Twist the dial to the desired watering duration anywhere from 15 to 120 minutes and the timer will turn your water off for you. You'll never have to worry about forgetting to shut the sprinkler off again. The mechanical operation requires no batteries and has a large dial with both timed watering and manual watering options.