Package Includes: 15pcs self watering spikes; 5 each green, beige, pink Adjustable Valve: This self watering spikes devices with control valve can control the dripping speed at 0-60s/drip for 1-15 days, just adjust the valve to suit your needs, perfect for vacation plant watering Simple and Convenient: No tools required, no need to drill holes in the bottle. Just fill the bottle with water, turn the plant watering devices upside down into the mouth of the bottle, then turn the bottle upside down and plug the spike into the soil Fits Most Bottles: Our plant self watering device is suitable for most plastic bottles. Compatible with all 2.8cm-3cm/1.1inch-1.18inch inner diameter Widely Application: Whether indoor or outdoor plants, this vacation plant watering spikes provides the right amount of water for each plant, perfect for potted plants, vegetables, garden plants, hanging baskets, outdoor gardens etc.