• MCU: ATSAMD21E18 32-bit Cortex M0+, 48MHz
• memory:256KB Flash, 32 KB RAM
• native USB, micro-B connector (HID)

• green power-on LED, i.e. "ON LED"
• red LED
• RGB DotStar LED

• GPIO: 5 KPL input/output pins
  • 3 pins function as 12-bit analog inputs
  • Aout, analog output, e.g. 10 bit audio output
  • 2 PWM pins e.g. for servos or LEDs
    • Capable of driving NeoPixel and DotStar LEDs

• native hardware SPI, I2C
• BAT input, external power 3-6V. On-board 3V regulator
• 3V pad, 3,3V 500mA power output, e.g. for sensors

• reset switch

Additionally:

• 1kpl 16-pin pin header

Dimensions:

• 27 x 15.3 x 2,75mm
• board mounting holes: 2,0mm

https://cdn-learn.adafruit.com/downloads/pdf/adafruit-trinket-m0-circuitpython-arduino.pdf