Datasheet

When powered from 3.3V they draw about 5mA so you can put up to 4 or 5 in parallel on a single microcontroller pin.

We currently have these sequins in warm white, emerald green, ruby red, and royal blue.

You can make the LEDs fade and twinkle by using the PWM (a.k.a. analogWrite) functionality of your Gemma or Flora,

or just connect directly to a digital I/O pin of a microcontroller to turn on and off (digitalWrite).