Versatile compatibility and practical design - 500ml bottles included and visually appealing. They are compatible with bottles that have a 1.10-1.18 inch inner diameter, offering flexibility and convenience. Suitable for vegetables, potted plants, herbs, and hanging baskets. The auto plant waterer helps you maintain plants while you are away. Easy to use and reliable - No complex installation required. Fill the bottle with water, connect the spike, and invert. The cone-shaped spike easily inserts into soil without harming roots. The drip outlet uses a double channel design for smooth, fluent dripping and reduced clogging. Innovative valve design for customizable watering - Drip spike features a slow release control valve and dual water dripping paths to prevent clogs and ensure steady flow. Drip speed is adjustable from 1s/1 drip to 90s/1 drip. This allows you to tailor watering to the duration of your vacation, from 1 to 15 days. Unique bottle design for stability and control - Each bottle is designed with an inclined angle for better stability when inserted into soil. The patterned surface increases friction for easy handling and installation. With a large 500ml capacity, these Plant Watering Devices support long-term watering. Use scenarios - Vacation care: set up for indoor vegetables or potted plants to water for up to 15 days while you are away. - Workweek consistency: keep herbs and small plants watered during days you are at work. - Balcony or hanging baskets: maintain soil moisture for hanging arrangements and container plants.