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Everyone will face the problem that you may write down too many things and forget which of them are urgent when using sticky notes. You may even no longer care about the contents on the notes and make them meaningless. This note is yellowish at the beginning and will turn red at a specific speed. Users can choose different speeds of changing color in accordance with the degree of urgency so that the note can become obvious when users need. It is made from a material which can be oxidized to red gradually in the air. Red can serve as a reminder and will not be too bright in an office.