Arduino Pro Mini 328 - 3.3V/8MHz
It's blue! It's thin! It's the Arduino Pro Mini! SparkFun's minimal design approach to Arduino.
This is a 3.3V Arduino running the 8MHz bootloader.
Arduino Pro Mini does not come with connectors populated so that you can solder in any connector or wire with any orientation you need.
We recommend first time Arduino users start with the Uno R3. It's a great board that will get you up and running quickly.
The Arduino Pro series is meant for users that understand the limitations of system voltage (3.3V), lack of connectors, and USB off board.
The latest and greatest version of this board breaks out the ADC6 and ADC7 pins as well as adds footprints for optional I2C pull-up resistors!
Dimensions: 0.7x1.3" (18 x 33mm)