Adjustable speed design: The plant irrigator with control valve can control the dripping speed. Because different plants have different absorption rates, you can adjust the traffic according to the time needed to 3 to 21 days, or more, and can prevent overwatering and make plants healthier, very good for scientific planting . Automatic watering: The latest plant irrigation design with water storage design effectively prevents water leakage from the bottle mouth, thickened design, strong support structure and prevents drainage of self-irrigation devices during use. The improved design of plant irrigation devices can ensure that the water pressure is not affected by the lowered water level. Easy to use: the watering system for plants does not require tedious installation, just tighten the drip watering devices and then insert them into the ground without the need for a nail and no danger. Our automatic watering system is ideal for watering the indoor flower, outdoor plant or your vegetables on vacation. Fits most bottles: the self-watering chuck is suitable for bottles of many sizes. They are no longer limited to bottles with an inside diameter of 1.1 inches. The new waterer is suitable for the bottle from 0.8 inch to 1.2 inch - The tilting bracket helps your self-irrigation system not tilt, although the suitable bottle is too big. Don't waste time finding the right bottle. Features: Can adjust the speed of the water jet more effectively without problem. According to number of days of your vacation, the slow release drip can last from 3 to 20 days, without you having to water every day. No longer limited to bottles with a diameter 1.1 inch interior. For best working results, we recommend small bottles. Due to different production methods, it is recommended to measure the time when the water first falls after adjusting each drinker , then estimate the approximate duration of water use using the table. (Please be sure to recalculate the dripping time before each use to ensure you are receiving the correct amount of water for your plants). We first measure with our cell phone the time during which each drop falls, then we put it into our formula in the upper right corner to determine how many days our water bottle lasts. Irrigation Plastic Bottle SPECIFICATION Material: polypropylene Working method: gravity Color: orange, green, blue No need for a knife to open the bottle Fits 98% of water bottles Water drops are virtually unaffected by water pressure. Quantity delivered: 12 pieces