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 needInstalled 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.The automatic plant waterer is suitable for all most bottles. it can suitable for the bottle from 0.8 into 1.2inThe automatic plant waterer made of high-quality PP plastic and you can use it repeatedly because each irrigation dripper ensures long service lifeWhether your plants are indoor or outdoor, at home or in the office, this self watering spikes system ensure your plants hydrated