Adjustable water flow - an automatic irrigation device that can adjust the dripping speed. Each drop can be set between 0 and 40 seconds, but it depends on atmospheric pressure or some environmental factors. You can test or control the water flow by turning the valve. The valve is easy to operate. adjust and the volume and speed are precisely controlled.Stable air pressure and constant air flow - the automatic irrigation device has space for a constant air flow, contrary to; other products that fully contact the bottle mouth and water mouthpiece, without puncturing or cutting the bottle. inside to outside, will never affect the water flow, it is very suitable for outdoor use. for continuous watering, don't worry about it falling sometimesNo leaks - The valve for automatic plant irrigation is square, which makes it easy to fully insert the valve body . It will not easily fall off when fully and firmly used, and there is no need to worry about water leakage when adjusting the valve to change the speed of draining.Suitable for; Different diameters - the mounting part of the bottle in the pour rod is limited due to its large diameter. It is suitable for; various bottles with a diameter between 1.8 and 2.5 cm. General beverage bottles such as Coca-Cola bottles, lime bottles and even wine bottles. Most types of bottles can be used for water spouts without drilling the bottom of the bottle All of these items can be used multiple times.Suitable for plants to outside and outside. indoors - Plant watering can be used to inside and out outside. Whether you have a potted plant or your plant is in the garden, when you use it in a potted plant, it is an effective drip rate. Make sure the pot is tall enough to handle the peak of water and the ground is deep enough to use.