2 version of the wearable card Adafruit GEMMA, small family member FLORA. Controlled by an ATtiny85 MCU, it is programmable via Arduino IDE through the MicroUSB port (in the 1 version it was a Mini-B). Diameter 28mm, 8K of flash, 512Byte of SRAM and 512 Bytes of EEPROM. Use an internal 8MHz oscillator. Requires only 9mA for normal operations. On board there is an 3,3V regulator with 150mA output, input up to 16V with reverse polarity protection, overheating and a current limiter.