Cheapest mini LED disco light.

This is by far one of the cheapest and most basic of the LED disco light units sold on eBay. It has the gyrating PCB on a cam arrangement that just grinds away all the time, and a set of red, green and blue LEDs that either sequence through 7 arrangements slowly or react to loud sounds with a flash and colour step.
It's actually quite bright for the size, and the circuitry is very basic.

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