Arduino Pro Mini 328 - (3.3V/8MHz ) Microcontroller by Sparkfun - Original info
Arduino Pro Mini 328 Microcontroller is a very small and light board based on ATMega328 microcontroller. The board is shipped without connection pins, so you can solder connection pins or cables on the board as you see fit and use the board according to your needs. The board works on 3.3V and therefore it’s compatible with devices like GPS or accelerometer running at 3.3V. The board is printed on 0.8mm thin PCB and it’s lighter than 2 grams.
Arduino Pro Mini 328 Microcontroller has 14 I/O pins. 6 of these pins can be used as PWM outputs while 8 of them can be used as analog inputs. Since it is working on low voltage levels, its maximum output current is 150mA. The board also has an over current protector circuit.
To power Arduino Pro Mini 328 Microcontroller, an FTDI cable, a regulated 3.3V or an unregulated source up to 12V can be used.
Arduino Pro Mini 328 - (3.3V/8MHz ) Microcontroller - General Specifications
ATMega328 microcontroller at 8MHz
USB connection off-board
Built in 3.3V regulator
Over current protection
Lighter than 2 grams
Arduino Pro Mini 328 - (3.3V/8MHz ) Microcontroller - Technical Specifications