Description: - 【Self Watering Device】: The plant self watering spikes can help automatically irrigate your plants during vocations, providing the accurate and right amount of watering. - 【Adjustable Flow Rate】: The plant watering device features a slow release control switch, that rotates to adjust the dripping speed of 2-30 drips/s, and the sustained drip lasts 1-20 days. - 【Easy to Use】: The automatic plant waterer is universal for most beverage bottles with a 2.8cm-3cm/1.10inch-1.18inch inner diameter ( Please note to measure the inner diameter of the bottle before use). - 【Wide Applications】: The auto drippers irrigation devices are suitable for indoors and outdoors, office, garden plants, planter pots, houseplants, potted plants, etc. - 【Compact Size】: Compact and lightweight drip irrigation control system, diameter x height 3.5cmx13.5cm/1.38inchx5.31inch, will not take up too much space. Specification: - Material: PP Size Chart: 3.5cmx13.5cm/1.38inchx5.31inch Package Includes: 5 Self Watering Spikes Note: Please allow slightly errors due to manual measurement and different monitors.