Adafruit ItsyBitsy 32u4-5V 16MHz

ATmega32u4 onboad chip in QFN package 5V power and logic, 16MHz clock rate, 2KB RAM and 28K FLASH Can act as a USB HID Keyboard, Mouse, MIDI or plain USB 'CDC' serial device Upgrade from the Pro Trinket 5V - native USB so it will work with all computers, USB serial debugging, and is a more reliable bootloader