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This is a new type of faucet to control the dropping time and amount of water flow. It is based on the timing button, a simple gadget, of the washing machine. The maximum rotation angle is 180°, at which water exit will last for 20 seconds. In general case, users revolve the knob above the faucet for less than 90° and on this occasion, water exit will last for 5 seconds proportionally. Users have no need to worry about whether the water stream energy is clean after finishing washing hands. Thus, people will have the consciousness for water saving.