The Arduino Pro Mini is a microcontroller board based on the ATmega168 (datasheet). Runs at 3.3V and 8 MHz. It has 14 digital input/output pins (of which 6 can be used as PWM outputs) 6 analog inputs an onboard resonator a reset button and holes for mounting pin headers. A six pin header can be connected to an FTDI cable or breakout board to provide USB power and communication to the board.

The Arduino Pro Mini is intended for semipermanent installation in objects or exhibitions. The board comes without premounted headers allowing the use of various types of connectors or direct soldering of wires. The pin layout is compatible with the Arduino Mini.