Adjustable Valve: The self-watering spikes with control valve, just adjust the valve to meet your needs. 550ml water supply time is about 5-7 days, 2000ml water supply time is about 7-20 days depending on soil dryness, humidity, etc. Upgraded Design: The upgraded irrigation spikes adjust the water flow rate more easily and effectively. You don't need to puncture the bottom of the bottle when using it, it will not stop watering due to water pressure. Best Choice for Travelers: Plant watering devices can help you water on time every day and ensure your plants are hydrated while you are away on your trip. Don't worry about your plants wilting! Suitable for Various Bottles: The plant watering device is suitable for most bottles, such as wine bottles, soda bottles, and other bottles with an inner diameter of 1.1 inches. Versatile: Suitable for automatic watering of potted plants, indoor plants, garden plants, vegetables, herbs, hanging baskets, outdoor gardens, small trees, shrubs, etc.