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This is a full panel of Pico LEDs (120 in total). You may have purchased less than a full panel, but this photo shows how each Pico LED is attached to the panel with two "fingers"-- one on the top of each Pico LED and one on the bottom.
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Each Pico LED has small markings above the copper pads-- one for positive ("+") and one for negative ("-"). We recommend orienting the Pico LEDs so the markings are on top as you solder-- this ensures that you know the + leads are on the left and - on the right.
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