Self-watering flowerpot

Self-watering flower pot is the best choice under these sitiuation. Self-watering flower pot can solve all above problems,
it makes us no worry about plant watering everyday when we are outside on business trips or vecation,
no worry about the plant roots rot or thirsty to die,no more planting again and again,the self-watering flowpot makes the planting real light-heartedness.makes the plants full of life.
How does the self-watering flowerpot work? why does self-watering flowerpot have so many advantages?