Adafruit Gemma - Miniature Wearable Arduino-like Electronic Platform by Adafruit Industries

Description

Super small, only 1.1" / 28mm diameter and 0.28" / 7mm thick., Easy-to-sew or solder pads for embedding in your wearable project, Ultra low power, draws only 9 mA while running, New Version 2 includes micro USB and a power switch!, 3 GPIO - The 3 independent IO pins have 1 analog input and 2 PWM output as well.