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Its always easy to forget watering plants in peoples busy daily life.
The stomach watering can feeds plants by means of osmosis automatically as they need. Determined by how dry they are, water is reserved hermetically in the special rubber-made balloon and delivered to the roots via a 'horn' rather than letting it evaporate from the surface of the soil. When the balloon shrinks its size, it tells that "the stomach of plant is empty" by direct visual language so that people can easily find plants request. When people are on vacation, the stomach can look after the plant as long as people fill adequate water in it before they leave.