It's thin! It's blue! It's the Arduino Pro Micro! The?Pro Micro?is similar to the?Pro?Mini except with an ATmega32U4 on board. This is also 5V 16MHz
AMK 2pcs Pro Micro ATMega32U4 for Leonardo 5V 16MHz India
Pro Micro 5v 16m Mini Leonardo Microcontroller Development Board Geekcreit for a for sale online
KEYESTUDIO 5V Pro Micro Atmega32U4 with USB Cable for Arduino Projects for sale online
Pro Mini ATMEGA328P 5V-16Mhz Development Board Compatible With Arduino
Description Features Documents It's blue! It's thin! It's the Arduino Pro Mini! SparkFun's minimal design approach to Arduino. This is a 3.3V Arduino
Arduino Pro Mini 328 - 3.3V/8MHz
12 digital I/O, 5 with PWM and 9 analog inputs in a tiny package.
Pro Micro 5V / 16MHz
just got my hands on these rp2040 in pro micro package. it'll be a busy week. : r/olkb
OSOYOO Pro Micro 5V/16MHz Module Board with 2 Row pin Header Replace wit Pro Mini for Arduino : Electronics
Arduino Nano V3
Nano V3.0 ATmega328 CH340G 5V 16M Micro-controller with Mini USB Cable – Envistia Mall
running at 5V/16MHz Supported under IDE v1.0.1 On-Board micro-USB connector for programming 4 x 10-bit ADC pins 12 x Digital I/Os
OSOYOO Pro Micro 5V/16MHz Module Board with 2 Row pin Header Replace wit Pro Mini for Arduino
Pro Mini ATMEGA328P 5V/16M (Official Version)
10pcs Mini USB ATmega32U4 Pro Micro 5V/16MHz Board Module For Arduino Leonardo ATMega 32U4 Controller Pro-Micro - AliExpress
running at 5V/16MHz Supported under IDE v1.0.1 On-Board micro-USB connector for programming 4 x 10-bit ADC pins 12 x Digital I/Os
OSOYOO Pro Micro 5V/16MHz Module Board with 2 Row pin Header Replace wit Pro Mini for Arduino
Arduino Micro Pro Pin Out