[Adjustable Valve]: Control the flow with ease. This plant watering device features a control valve that adjusts dripping speed from 0 to 60 seconds per drip, providing sustained watering for 1 to 15 days. Simply adjust the valve to meet your needsno complicated setup required. Saves time and water. [Simple and Convenient]: No tools needed for installation. Just drill holes in the bottle bottom or cut the bottle tip to allow continuous air circulation. [Precise Water Volume]: Deliver the right amount of water for different plants and flowers. Avoid common watering issuestoo little or too much water can cause leaf yellowing and drop. Prevent overwatering or underwatering with accurate control. [Compatible with Common Bottles]: Works with standard plastic bottles including Dr. Pepper, Pepsi, Coca-Cola, Lipton, Diet Coke, Aquafina, and other bottles with a 1.1-inch inner diameter. (Bottle not included.) [Multi-Scene Use]: Ideal for vegetables, potted plants, indoor plants, daily water plants, patio plants, herbs, hanging baskets, desktop pots, hanging plants, outdoor gardens, small trees, and shrubs. Specifications: 30 Pieces