Features
33mm x 15mm (1.3 x 0.6 inch)
22 GPIO pins: 9 Analogs inputs, 21 PWM, 2 Serial, 3 SPI, 3 I2C
All GPIO is 5 volt tolerant (Arduino compatible)
2 rows of 9 0.1" pins, with a third 0.05" row of 8 pins on the end
On-board USB Type A connector
Two on-board LEDs and one button.
STM32F401CDU6 CPU - ARM Cortex M4, 384kb flash, 96kb RAM
On-board 3.3v 250mA voltage regulator, accepts voltages from 3.5v to 16v
Current draw in sleep: < 0.05mA - over 2.5 years on a 2500mAh battery
On-board FET can be used to drive high-current outputs
Part List
Espruino Pico (unpinned) x 1
https://www.seeedstudio.com/Espruino-Pico-%28unpinned%29-p-2548.html 5-9-2017