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Rainbow song, is an emotional and variable light. According to the principle of light synthesis, the light makes three lights with different colors (red, blue, green) in different directions to compound a light with a new color by a concave lens. The users can choose any colors of lights by adjusting the brightness of three different lights. All the process of control can be achieved easily by slipping your fingers on the remote control. The users can choose the right color of light according to their emotion and the situation, which can bring more interests and fun to your changeless daily life.