Arduino Mini 05 without Header Additional features coming with the 05 version are: new PCB layout and design and onboard reset button Microcontroller ATmega328 Digital I/O Pins 14 (of which 6 provide PWM output) Analog Input Pins 8 (of which 4 are broken out onto pins) Clock Speed 16 MHz,Flash Memory 32 KB (of which 2 KB used by boot loader),SRAM 2 KB,EEPROM 1 KB