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One side of the device is covered by white lampshade, and the other side of the device is covered by black lampshade. By revolving the device, the bulb inside will also revolve by gravity. When the light comes out from white lampshade, the light will become much brighter. On the other side, when the light comes out from dark lampshade, the light will become dimmer. In this way, we can easily and immediately adjust the brightness, and even turn off and turn on the light by revolving the device.