Package Included:40pcs Bottle Drip Irrigation+40pcs Switch Material: PP plastic, convenient and practical. Bottle drip irrigation, which is durable, sturdy, environmentally friendly, reusable, recyclable and durable. This product is suitable for bottles with a diameter of 1.1 inches Adjustable Valve: The flow rate can be controlled. The plant watering device with regulating valve can control the drip speed from 0 to 60 seconds / drip, and the continuous drip lasts for several days. Adjust the valve only to meet your needs without complicated setup steps. Save time and water. Easy to Use: Bottle drip irrigation, quick installation, no need to rotate, just put it down, plant waterer, deliver water directly to the roots of plants, suitable for most plants. Easy flow control means your plants get the correct amount of water. How to Use: Prepare a cola bottle, fill it with water, screw the dripper onto the bottle, Drill a few more holes at the bottom of the bottle, Make sure air can enter