The newly designed valve allows you to control the dripping speed from 0 to 60s per drip,lasts 1-15 days according to the length of your vacation, auto watering your plants while you are away on vacation.Helps you save some water,super cool plant self watering system you deserve to have!The Plant self watering devices support most common plastic bottles which have an inner diameter of 1.1 inch, like 20 ounce Pepsi, Coke, Dasani water, and Lipton iced tea,Dr.pepper,Lipton,Deet Coke,Coca Cola,Pepsi,Aqufina,Clear American,Soda water bottles and moreKeeping your plant properly watered: Different types of plants require different amounts of water.With our automatic plant watering system with adjustable valve you can easily calculate how much water to drip for your plants.This plant watering system can effectively recycle and use plastic bottles, made of ABS plastic. It can be applied for 30 years. It can be repeated and applied to reduce unnecessary expensesMaterial: PP Package:12pcs/Set Package Size:20*11*4cm Suitable bottle: Dr.pepper, Pepsi, Coca-Cola, Lipton, Deet Coke, Aquafina or other 1.1-inch inner diameter bottles.Product Efficiency: This water spikes machine is a product that automatically regulates watering time for those who go out for holiday or have no time to care for flowers.Usage Method: Fits for use with potted plants, houseplants, patio plants, hanging baskets, desk pots, hanging plants and outdoor gardens