【Adjustable Valve】 The flow rate can be controlled. The plant watering device with a control valve can adjust the drip speed from 0-60s/drip, and the continuous drip lasts for 1-15 days. Just adjust the valve to meet your needs without complicated adjustment steps. 【Simple and Convenient】 No tools are required for installation, just drill some holes in the bottom of the bottle or cut off the back of the bottle to allow air to flow. 【Used in Multiple Scenarios】 Vegetables, potted plants, houseplants, daily water plants, outdoor plants, herbs, hanging baskets, table bowls, hanging plants, outdoor gardens, small trees, shrubs. 【Warning】 Compatible with all bottles with 1.1 inch / 2.8 cm inner diameter, suitable for most beverage bottles, not suitable for mineral water and pure water bottles. (Measure the inner diameter of the bottle, including the thread size, before installation)