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This is an air cleaner. When you touch the top (the leaf) , it starts to work and the light in the middle turns on. The light's blinking frequency is determined by the inner air-testing monitor and user settings. If air in room is bad and user hope to let it clean in 30 min, then the light turn red, at high blinking frequency. If the air is clean, the light will stay blue, at low blinking frequency. It's working mood just like a man's running hard to the destination and silent mood shows man's rest. Yellow light is for emergency or error. This concept hope to let user feel the cleaner's working state and their air quality.