The Teensy USB Development Board is a complete USB-based microcontroller development system.

Version 3.2 features a 32 bit ARM processor.

Teensy 3.2 is a direct, 100% compatible replacement for Teensy 3.1. It is fully compatible with all shields and add-on boards made for Teensy 3.1, including the Audio Board and OctoWS2811 Adapter.

All Teensy boards are shipped assembled and fully tested.

Teensy 3.2 adds a more powerful 3.3 volt regulator, with the ability to directly power ESP8266 WiFi, WIZ820io Ethernet and other power-hungry 3.3V add-on boards.

More information on Teensy differences available here