"Adjustable Water Volume Drip System The automatic plant Self Watering Spike Device consists of a slow release control valve switch, and the watering speed can be adjusted. About 500ml water for 5-7 days, 2000ml for 7-20 days. Irrigation Drippers Suitable for All Bottles The upgraded self-watering spike fits for all bottles normal size bottle in daily life, from 0.8in to 1.2in. Don't waste time finding the right bottle, most bottle make the self-watering system work. Automatic elf Irrigation Watering Drip Devices No tools are required for installation. Screw the regulating valve. Tighten the holder. Insert the bottle that with water. Inverted plant waterer and bottle, insert into the soil. Reliable Material Our plant watering spikes are made of high-quality PP plastic, recycling and eco-friendly, strong and durable. And our irrigation drippers ensures a long service life for daily using. Multi-scene Application The Self Watering Spikes Device is a helpful partner for your plants, no matter your plants are indoor or outdoor, at home or in the office. Enjoy your vacation with your family, leave your plants to me "