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 drip lasts for 1-15 days. Only adjust the valve to Meet your needs without complicated setup steps. Save time and water.Simple and Convenient: Installed without any tools, just drill some holes in the bottom of the bottle or cut the tail of the bottle to keep the air flowing.Accurate water volume: Provide different amounts of water for different plants and flowers, do not become plant killers, other watering devices are either too little or too much in some plants, old leaves just turn yellow and fall but if new growth Yellow, it may be an indication of over-watering or underwater.Suitable for brand bottles: Dr. Pepper bottle, Pepsi bottle, Coca-Cola bottle, Lipton bottle, Diet Coke bottle, Aquafina bottle or other 1. 1-inch inner diameter bottles. (Bottle not included).Multi-Scene Application: vegetables, potted plants, houseplants, water plants day-to-day, patio plants, herbs, hanging baskets, desk pots, hanging plants, outdoor gardens, small tree, shrubs.