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In modern society many people are inevitable to face the screen or use the computer for long time on their work everyday，especially in some Asian countries. We all know that sitting long time before computers does harm to people’s health. This design gives a solution for the problem. The product can monitor the condition of using computer. When the light turn red people have to get away from the keyboard for a rest at least ten minutes since the keyboard will be locked and during which time to “restore the energy”. When it turns green again, it means you can start using computer again.