This is a desk lamp designed with reference to a mechanical scale. The brightness of the light can be adjusted by sliding the ball on the desk lamp left and right. When the ball is in the red area on the left, the light is off. Therefore, when we use it, turning on the desk lamp or adjusting the brightness of the light can increase the user's experience and interest.
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What is the principle? It's great
Thought of sliding rheostat ha ha ha
Old-fashioned mechanical scales have a sense of sight.
Great
Not bad oh ~ this operation is very convenient
It's quite interesting