[Adjustable valve]: The flow can be controlled. The plant watering device with control valve can control the dripping speed from 0-60s/drip, and the sustained dripping lasts 1-15 days. Adjust just the valve to meet your needs without complicated setup steps. Save time and water. [Simple and Convenient]: Installed without any tools, just drill holes in the bottom of the bottle or cut the tail of the bottle to make the air continues to circulate. [Precise 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, the old leaves turn yellow and fall off, but if the new growth is yellow, it may indicate overwatering or under water. [Suitable for branded bottles]: bottle Dr. Pepper, Pepsi bottle, Coca-Cola bottle, Lipton bottle, Diet Coke bottle, Aquafina bottle or other bottles with 1.1 inch inner diameter. (Bottle not included). [Multi-scene application]: vegetables, potted plants, indoor plants, day-to-day water plants, patio plants, herbs, hanging baskets, desktop pots , hanging plants, outdoor gardens, small tree, shrubs. specifications30Pcs