Features:[Automatic Plant Irrigation System]: make sure your plants are never thirsty, the self-watering pot puts in the watering of the plants; Place these automatic feeders aquatic plant in the soil of your potted plants, hanging baskets, and your box or outdoor gardens to keep the soil moist. [Adjustable Water Flow]: Instead of watering your plants every day, use these devices to water your houseplant to release water automatically; Rotate the 1/2 inch (1.3cm) end cap on the adjustable dropper to control the dripping rate; Slower drip speeds can ensure that water lasts up to 15 days without refilling. [Fits Your Water Bottle]: The 5.3 inch (13.5cm) long auto irrigation has a 0.6 inch (1.5cm) diameter threaded head to attach to your water bottle; Compatible with 28mm caliber water bottles (not included). [Easy to operate]: in use, attach the water bottle to the automatic spikes for watering indoor plants; Turn the bottle upside down and slide the watering wand into the soil of the houseplant; Each plastic cone gradually shrinks, so the 1/8-inch (3mm) wide tip slides easily through the dirt. Specifications:Material: PP Size: 13.5*3.5cm Color: As shown in the picture Compatible with: 28mm caliber water bottles (not included)Package Included: 3/6pcs Automatic Rate Plant Irrigator Note: Please allow 1-2cm deviation due to manual measurement. The actual color may be slightly different from the picture due to different monitor and lighting effect.