Adjustable speed: the flow can be controlled. The plant watering device with control valve can control the drip speed from 0-60 seconds/drop, and the drip lasts from 1-15 days. Simply adjust the valve to meet your needs, no complicated setup steps required. Save time and water. Don't worry about your plants withering on business trips or vacations. Simple and convenient to use: No tools are needed for installation, just drill holes in the bottom of the bottle or cut the tail of the bottle to maintain air circulation. Eco-friendly and durable - The automatic plant watering head is made of high quality PP plastic, which you can reuse because every drop ensures a long life. Self-watering outdoor plant nails have high strength and toughness, good heat and cold resistance, safe and durable. Efficient recycling of plastic bottles. Reduce waste and protect the environment. Suitable for different bottles - The automatic plant waterer is suitable for all bottles. Fits 2.54cm bottles. Don't waste time looking for the right bottle, most come with self-watering spikes. Multiple Uses: Whether your plants are indoors or outdoors, at home or in the office, this self-watering spike system will keep your plants hydrated. These plant watering sets are perfect for potted plants, indoor plants, garden plants, garden pots or any other plants. Note: The data is all manual measurement, please allow 1 - 3cm error, due to the difference in light and display, there will be some color difference, depending on the physical object received Delivery Quantity: (according to the main image)