Adjustable Water Volume Drip System: The automatic plant self-watering spike device features a slow-release control valve switch, allowing adjustable watering speed. Provides approximately 500ml of water over 5 to 7 days, and 2000ml over 7 to 20 days. Irrigation Drippers Suitable for All Bottles: The upgraded self-watering spike fits standard bottle sizes commonly found in daily use, with diameters ranging from 0.8 inches to 1.2 inches. No need to search for a specific bottlemost standard bottles are compatible with this self-watering system. Automatic Self-Irrigation Watering Drip Devices: No tools required for installation. Simply screw on the regulating valve, tighten the holder, fill a bottle with water, and invert the bottle and device into the soil. Reliable Material: Made from high-quality PP plastic, these plant watering spikes are durable, eco-friendly, and designed for long-term use. The irrigation drippers are built to ensure reliable performance for daily watering needs. Multi-Scene Application: Ideal for both indoor and outdoor plants, whether at home or in the office. This self-watering spike device helps maintain healthy plants, making it a convenient solution when traveling or during extended absences.