Adjustable Valve: The flow rate can be controlled. The plant watering Device with control valve can control the dripping speed of 0-60s/drip, and the sustained release drip lasts for 1-15 days. Only adjust the valve to Meet your needs without complicated setup steps. Save time and water.^ Without Any Tedious Installation: Using a standard bottle with a 1.1 inch diameter opening, either drill or cut holes at bottom of the bottle and place a regulating valve that will adjust the speed of flow.^ Worry Free Planting: Accurate water volume, provide different amounts of water for different plants and flowers, each plant is unique.you dont have to take care of your plants every day.^ Enjoy Your Vocation: More healthy plants Enjoy your holiday with your family, leave your plants to me, self water your plants and vegetables, and make your plants thrive; Recycle plastic bottles effectively. Reduce waste and protect the environment.^ Multi-Scene Application: Whether indoor/outdoor plant or garden, home or office, this self watering spikes system ensure your plants hydrated. And the watering device is perfect for potted plants, houseplants, patio plants, hanging baskets, deck pots, hanging plants and many more.