Adafruit 24-LED NeoPixel Ring
This Adafruit NeoPixel ring contains 24 individually addressable RGB LEDs arranged in a closely spaced circle that can all be controlled with a single digital output of a microcontroller. The ring has a 2.6″ (66 mm) outer diameter, and several rings can be chained together, making them great for adding some shine to a small robot or wearable electronics project.
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WS2812B integrated LED and driver datasheet (266k pdf)