You might think of the Gemma as a “lite” version of the Flora. It has just 3 digital I/O pads, but at 1.1″ in diameter, it’s incredibly tiny. Like the Flora, it has an onboard battery connector, and is programmable via the Arduino IDE. While it may seem that its minimal I/O count limits its potential, many projects don’t require lots of I/O pins, making the Adafruit Gemma the ideal choice for simple wearables designs.