USB bootloader with a nice LED indicator, AVR109 compatible (same as Flora, Feather 32u4, Leonardo, etc).3.3V power and logic, 8 MHz clock rate, 2KB RAM and 28K FLASH.Basically what this means is if you want to drive NeoPixels, a picky servo, or a high-dropout-voltage LED from this board, and you want a 5V-logic-level output, this pin is the one you should use! We also made the digital #5 pin extra special on this board, it connects to a level shifter so it is only an output but the output is that 'high logic'. There's a VHigh pin, this pin is a power pin whose voltage is the higher of VBAT and VUSB. We have two special pins on the 3V version of this board. You can even use the Pro Trinket LiPo backpack with this board to add recharge-able battery. We recommend this as an upgrade from the Pro Trinket 3V because this has native USB so it will work with all computers, USB serial debugging, and a more reliable bootloader. It even runs at the same voltage and speed as the Feather 32u4, so you'll be happy to hear that not only is Itsy Bitsy programmable using the Arduino IDE as you already set up, but a vast number of projects will work out of the box! The Itsy Bitsy 32u4 3V 8MHz uses the Atmega32u4 chip, which is the same core chip in the Arduino Leonardo as well as the same chip we use in our Feather 32u4. So it's great once you've finished up a prototype on a bigger Arduino, and want to make the project much smaller.

It packs much of the same capability as an Arduino UNO or Feather 32u4.

Itsy Bitsy is only 1.4' long by 0.7' wide, but has 6 power pins, 6 analog & digital pins and 17 digital pins.

What's smaller than a Feather but larger than a Trinket? It's an Itsy Bitsy! Small, powerful, Arduino-compatible - this microcontroller board is perfect when you want something very compact, but still with a bunch of pins.

Adafruit trinket 5v arduino ide