Melnor Mechanical Daily Water Timer for Outdoor Garden Hose Simply turn the knob to set the amount of time to water for up to 120 minutes Water automatically shuts off after running for selected amount of time, no batteries required Manual feature on/off to use like a faucet Works with low pressure drip and soaker hoses Melnor products use GHT (Garden Hose Threads). Adapters may be necessary outside of the United States and Canada