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 : The plant watering device features a slow release control switch, that rotates to adjust the dripping speed of 0-60s/drip, and the sustained drip lasts 1-20 days.Easy to Use: The automatic plant waterer is universal for most beverage bottles with a 1.1 inch/2.54cm 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, height x width 13.5cmx3.5cm/5.31inchx1.38inch, will not take up too much space. Specification: Material: PP Package Includes: 6 Self Watering Spikes Note: Please allow slightly errors due to manual measurement and different monitors.