This is a Nelson 56600 hose timer does not require batteries and is a simple low cost way to manage your water usage. All you need to do is turn the dial on the timer to your desired watering time and that s it. The timer will shut off the water flow to your sprinklers when the timer goes off. No more worrying about flooding your lawn with the Nelson 56600 hose timer. Features and Benefits: Can water for 120 minutes or less, Single outlet, No batteries required. Flow Rate: 20 PSI = 7 GPM, 40 PSI = 10 GPM, 60 PSI = 11.5 GPM.