Enjoy Your Life: No need to hire a house sitter to water your plants while you are on vacation. your vacation. Perfect Design: Plant spikes fit most bottles: These plant watering devices are compatible with 1.1 inch inner diameter bottles and easy to find. Suitable for outdoor and indoor use: made of high quality ceramic material, good permeability and weather resistance, durable for long time use and extra long stakes for a stable device. Irrigation Automation: The pre-water can prevent flooding and overflow and promote healthier roots. It makes gardening easier and makes the plant healthier. Durable: On average, a stake with a 1 liter bottle lasts 5-7 days, while most other stakes only last 2-3 days. The secret is ceramic.