Features: 1. The water will be slowly emitted through the device within 15 days, automatically watering your plants. The drip speed is adjustable. 2. Use easy flow control to ensure your plants are watered anytime. 3. Simply screw a spike onto a full bottle of water, then insert the pointed end directly into the soil near a potted plant's stem. 4. Do not worry about watering your plants when away on a short break; this device attaches to any screw-top bottle and waters for you. 5. Combine water and plant food in a bottle, then use the water spike to deliver nourishing fluid. Specification: Material: PP Color: GREEN Size: 13.5 x 3 cm Note: The controller fits bottles with a diameter of 2.54 cm (1.1 in). Bottles with a diameter of 2.8 cm or larger are not compatible. Package Included: 12 pcs Flower Drip Spikes GREEN