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The NeoPixel Jewel is a lovely round PCB, home to 7 tiny WS2812 5050 (5mm x 5mm) smart RGB LEDs. Each LED has a driver chip built into it, making them individually addressable. Many units can be chained together and run by a single microcontroller by connecting the output of one Jewel into the input of another! Each NeoPixel has ~18mA constant current drive so the color will be very consistent even if the voltage varies, and runs on 5V.