USB-based microcontroller development system Processor: AT90USB1286 8 bit AVR 16 MHz I/O: 46, 5 Volt Compatible with Arduino Software & Libraries Works with Mac OS X, Linux & Windows The Teensy++ 2.0 USB Microcontroller Development Board is a complete USB-based microcontroller development system. Only a standard Mini-B USB cable (sold separately) is needed to connect to a PC or Macintosh. This version has soldered pads for all I/O signals. The Teensy is also available with the header pins to plug directly into a solderless breadboard: {{widget type="catalog/product_widget_link" anchor_text="Teensy++ 2.0 USB Microcontroller Development Board (w/ Pins)." title="Teensy++ 2.0 USB Microcontroller Development Board (w/ Pins)." template="catalog/product/widget/link/link_inline.phtml" id_path="product/25631"}} It is compatible with Arduino Software & Libraries. It is easy to use with the Teensy Loader application.