Made of ceramic and plastic, this automatic watering device for plants in pots and containers, indoors and outdoors. When the soil is dry, this ground spike provides targeted and gradual drainage. When the soil is sufficiently moist, the dripping stops automatically. You can also add liquid plant fertilizer to stimulate growth. Simply screw it into an old plastic bottle filled with water and then insert it into the soil. You don't need to leave the bucket of water next to it. 600 ml is enough for about 5-7 days. Total length approx. 11.5 cm, the opening has 3 different sizes, maximum 5.2 cm (outer diameter), fits most screw-top bottles up to 3 liters. Note: The data is manual measurement. Please allow 1-39 cm tolerance. Due to differences in light and screen, some color differences may occur. The actual color received shall prevail.