Based on the ATmega328P chip used on the popular Arduino UNO. This small (1"x2") development board can run any sketch used on the Arduino. Also adds the ability to make your project portable with a lithium-polymer battery. This easy to assemble kit includes all the part needed to make a small version of the Arduino. Comes pre-loaded with the same bootloader as used on the UNO. Visit http://bantamboard.fireflyelectronix.com
for assembly instructions and more detail.