ADJUSTABLE VELOCITY DESIGN - The self watering spikes with a control valve can control the dripping speed of 0-60s/drip. You can set traffic for 3-15 days or More depending on the time you need and will never influence the growth of your plants for the water is flowing too fast or too slow. Don't worry about your plants withering during travel for business or travel on holiday. SIMPLE AND CONVENIENT TO USE - Installed without any tools, just drill some holes in the bottom of the bottle or cut the tail of the bottle to keep the air flowing, and then insert these self watering spikes into the soil. SUITABLE FOR DIFFERENT BOTTLES - The automatic plant waterer is suitable for all most bottles. it can suitable for the bottle from 0.8 into 1.2in. Won't waste your time finding the right bottle, most bottles make the self watering spikes work. Such as Coca-Cola bottles, soda bottles, even wine bottles. ECO-FRIENDLY AND DURABLE - The automatic plant waterer made of high-quality PP plastic and you can use it repeatedly because each irrigation dripper ensures long service life. The self watering spikes for outdoor plants with high strength and toughness, good heat and cold resistance, safe and durable. Recycle plastic bottles effectively. it reduces waste and protects the environment. WIDELY APPLICATION - Whether your plants are indoor or outdoor, at home or in the office, this self watering spikes system ensure your plants hydrated. These plant watering devices are perfect for potted plants, houseplants, patio plants, hanging baskets, deck pots, hanging plants or any other plants.