[Adjustable Valve]The automatic watering nail device with an adjustable valve can freely control the dripping speed between 0-60 seconds/drop. [UPDATE PRACTICAL DESIGN]Our design, plant self-watering spikes maintain air circulation without drilling holes. Rely on atmospheric pressure to keep water flow consistent and avoid slowing down or even stopping the flow as water storage decreases over time. Let you go out without worries. [High Compatibility]The plant adjustable drip irrigation system adopts a plug-in interface design. Available in a variety of bottle sizes, you're no longer limited to looking for bottles with a 1.1-inch inner diameter. Suitable for all bottles with openings of 0.8 inches-1.2 inches. When inverting the bottle, turn it over quickly to prevent water from spilling. Colour:Photo Color Material:plastic Package Contents: 1set x automatic watering device for gardening Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.