Arduino Leonardo Pinout includes 20 digital I/O pins, 12 analog inputs and 7 PWMs. It uses ATmega32U4 microcontroller working at 16 MHz.
Introduction to Arduino Pro Micro - The Engineering Projects
XC4431 Leonardo Tiny Dev Board - Keyestudio Wiki
Pro Micro pinout
Pro Micro - 5V/16MHz - DEV-12640 - SparkFun Electronics
Arduino Leonardo +nrf24l01
Arduino Uno Rev3 — Arduino Official Store
Introduction to Arduino Leonardo - The Engineering Projects
Arduino Leonardo Specifications/Functions
SMALLEST Arduino DEV Board EVER!
Arduino Uno Pinout, Specifications, Pin Configuration & Programming
Arduino Leonardo Pinout: Connection Points for the ATmega32u4
Arduino Micro — Arduino Official Store