SIMENMAX 12 PCS Plant Waterer Self Watering Spikes System with Slow Release Control Valve Switch Self Irrigation Watering Drip Devices for Outdoor Indoor Flower or Vegetables [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 release 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]:No tools are required for installation, 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, each plant is unique. [Widely Compatible]: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) [Healthy Plants & Environmental Protection]:Enjoy your holiday with your family, leave your plants to me, self water your plants and vegetables, and make your plants thrive; Recycle plastic bottles effectively. Made of environmentally friendly material ABS plastic, it can be reused for 30 years. Reduce waste and protect the environment. 12 month warranty & 90 days money back - We provide a 12 month warranty and 90 days money back guarantee for this product, if you have any problems or are unsatisfied with your order, you can contact us at any time, we will help to replace or refund your money immediately.