The Arduino Pro Mini is SparkFun's minimal design approach to Arduino. It's essentially a 5v Arduino that runs an 16 MHz bootloader on a super small, super thin board. There are no connectors attached - allowing you to add whatever connectors or wire you want without too much trouble. https://elecena.pl/product/17500349/arduino-pro-mini-328-5v-16-mhz 2021-04-06 https://elecena.pl/product/17500349/arduino-pro-mini-328-5v-16-mhz 2025-04-24