1、The flow rate can be controlled. The plant watering device with control valve can control the dripping speed of 0-60s / 1 drip, and the sustained release drip lasts for 1-15 days. 2、Simple and convenient, no need for any cumbersome installation, just drill some holes in the bottom of the bottle or cut the tail of the bottle. 3、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, the old leaves just turn yellow and fall. But if the new growth is yellow, it may be an indication of over-watering or underwater. 4、Suitable for bottles with 1.1-inch inner diameter. 5、Enjoy your vacation with your family and leave your plants for me. Watering nails for your vegetables, indoor and outdoor gardens, daily aquatic plants, potted plants, indoor plants, herbs, garden plants, hanging baskets, washbasins, hanging plants, small trees, shrubs. Quantity: 12Pcs Product material: PP 12 x Adjustable Self Watering Spikes