Flow control: Sprinkler device with control valve to control the drop speed. Easy to use: Without any cumbersome installation, all you need is to pierce the bottom bottle or cut it. Appropriate amount of water: provide the appropriate amount of water to different plants and flowers, will not become a plant killer, nor too little or too much water. In some plants, the old leaves turn yellow and fall off. But if the new growth is yellow, it may be a sign of over-irrigation or dehydration. Enjoy your vacation with your family, your plants are leaving me. Self-Planting Watering Spikes Provide Water For Your Vegetables, Indoor Outdoor Gardens, Daily Water Plants, Potted Plants, House Plants, Herbs, Garden Plants, Hanging Baskets, Pots desk, hanging plants, small trees, shrubs. Instructions for use: 1. Put the control valve in the sprinkler. 2. Put the bottle on the tips. 3. Keep the bottle vertical. Regulates the water flow. Note: 1. Suitable for the inside diameter of the bottle, including the wine bottle, filled with water, plugged in and finished. Before each use, set the maximum water flow, make sure there is no no air in the switch, then set the water flow low. 3. After adjusting the flow speed, bury the switch output in the ground, the flow speed will be stable. 4. It is important to keep the tips vertical. Contents: 12 automatic sprinklers. Note: this does not include other things, the color is based on the first picture and others Pictures only show effect Due to the differences between different monitors, the picture may not reflect the actual color of the item. Due to manual measurement. Please allow deviation. Thank you!