The most exciting part of the ItsyBitsy M4 is that while you can use it with the Arduino IDE, it's shipped with CircuitPython on board. When you plug it in, it will show up as a very small disk drive with main.py on it. Edit main.py with your favorite text editor to build your project using Python, the most popular programming language. No installs, IDE or compiler needed, so you can use it on any computer. When you're done, unplug the Itsy' and your code will go with you.

Specifications:
- ATSAMD51 32-bit Cortex M4 with 512 KB Flash and 192 KB RAM
- 3.3V logic, 120 MHz, 32 bit processor
- 2 MB SPI FLASH chip for storing files and CircuitPython code storage
- Native USB supported by every OS - can be used in Arduino or CircuitPython as USB serial console, Keyboard/Mouse HID, even a little disk drive for storing Python scripts
- Can be used with Arduino IDE or CircuitPython
- Built in red pin #13 LED
- Built in RGB DotStar LED
- 23x GPIO pins
- 2 x True analog output pin - can be used to play 12-bit quality audio clips
- 18 x PWM outputs - for servos, LEDs, etc
- 7 x 12-bit analog inputs
- 8 x Hardware capacitive touch sensors with no additional components required
- 1 x Special Vhigh output pin gives you the higher voltage from VBAT or VUSB, for driving NeoPixels, servos, and other high-current devices. Digital 5 level-shifted output for high-voltage logic level output.
- Built in crypto engines with AES (256 bit), true RNG, Pubkey controller
- Can drive NeoPixels or DotStars on any pins, with enough memory to drive 60.000+ pixels. DMA-NeoPixel support on the VHigh pin so you can drive pixels without having to spend any processor time on it.
- Native hardware SPI, I2C and Serial all available
- Reset button and pin
- Power with either USB or external output (such as a battery) - it'll automatically switch over
- Dimensions: 35.9mm x 17.8mm x 4.2mm, weight 2.4 g