AUDEW 2pcs Indoor Automatic Drip Watering System for Houseplant Plant Tender Waterer Self Watering Probes are a simple and effective way of watering your plants while you are on vacation. Just soak them in water for a couple of minutes to prepare the tips, then insert the probes into the soil of your potted plants and place the hose ends in a water reservoir nearby. Using no power source, this high-quality, European-design but made in China plant waterer will automatically keep a potted plant's soil at the optimum moisture level. Great for people who travel and want to make sure their plants are properly watered. Large planters will need two or more plant waterers. As the water in the clay cone is drawn into the dry soil, it creates a vacuum that pulls more water in through the supply hose.