The Teensy USB Development Board is a complete USB-based microcontoller development system.
Version 3.6 features a 32 bit 180 MHz ARM Cortex-M4 processor with floating point unit.
All digital and analog pins are 3.3 volts.
Do not apply more than 3.3V to any signal pin.
Actual size is 2.4 by 0.7 inch
All Teensy boards are shipped assembled and fully tested.