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This is a simple ambient light that can be used in any scene with USB jacks such as computers, TVs, cars, mobile charging treasures, etc. Their brightness is not exactly the same.Their brightness from high to low is white ≥ green ≥ blue > light blue ≥ purple > red ≥ yellow. That is to say, if you like high brightness, you can choose white, green, blue; if you like medium brightness, you can choose light blue, purple; if you like low brightness, you can choose red, yellow. Please note that its brightness is not enough to use as a professional reading light.