So you are looking for a wearable device to help you put on a light show? Why not 3D print your own and learn some electronics in the process. Adafruit has shared a guide that shows you how to build your own NeoPixel LED Bracelet with a 3D printer. You are going to need an Adafruit 5V Trinket, Mini Skinny NeoPixel Strip, 1x 150mAh Lithium polymer battery, and a few other parts to get started.
More gadgets like this: here
The bracelet comes with a USB port accessible from the side and is held using strong magnets. You can find the complete list of tools and parts here.
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