This is a 3.3V Arduino running the 8MHz bootloader .
The Arduino Pro Mini 328 doesn’t come with connectors populated so you can solder in any connector or wire with any orientation you need.
The Arduino Pro series is meant for users that understand the limitations of system voltage (3.3V), lack of connectors, and USB off board.
- Microcontroller: ATmega328
- Power Supply: 3.35 -12 V
- Circuit Operating Voltage: 3.3V
- Digital I/O Pins:14
- PWM Pins: 6
- Analog Input Pins:6
- Flash Memory: 32KB of which 2 KB used by bootloader
- Clock Speed: 8 MHz