Bought a set of two, blue and red. The red block glows brightly when active, the blue barely, see photo. I thought the blue block was defective and sent the two packs back to Revain for an exchange. When I received a new pair a week later, I saw the same thing. Obviously the difference in the color of the plastic case either boosts the LED or suppresses it. In terms of performance, they work flawlessly. I like the design that hides the plug without losing the cap.
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