Adjustable water flow: water dispenser plant valve can control drip speed 0-60s/1 drop. Set the traffic to 3 to 21 days, or more depending on the time required. Ideal for short business trips or short vacations. Automatic watering: automatic watering system works automatically, delivering water directly to the plant roots, automatic watering set eliminates the worry of forgetting watering or leaving unattended. You don't need to water every day. Wide Compatibility: Self-watering spike is suitable for many size bottles. The plug-in interface design is compatible with bottles from 0.8" to 1.2". No nails and no risk: automatic watering system, just put on the drip irrigation devices, then plug them into the Soil, no nail required and no danger, plant watering equipment is very suitable for scientific plants when you are on vacation or busy. Indoor and outdoor use: automatic watering kit can be used for potting soil, flowers , hanging baskets, herbs, vegetables and many other indoor and outdoor plants for watering, gardens and offices. Automatic.tc.