Teensy v2.0 USB Board - ATmega32U4 AVR

Description
Question on item

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

Actual size is 1.4 by 0.7 inch

Specification	Teensy 2.0	Teensy++ 2.0	Teensy 3.0
Processor	ATMEGA32U4 8 bit AVR 16 MHz	AT90USB1286 8 bit AVR 16 MHz	MK20DX128 32 bit ARM Cortex-M4 48 MHz
Flash Memory	32256	130048	131072
RAM Memory	2560	8192	16384
EEPROM	1024	4096	2048
I/O	25, 5 Volt	46, 5 Volt	34, 3.3 Volt
Analog In	12	8	12
PWM	7	9	10
UART,I2C,SPI	1,1,1	1,1,1	3,1,1

Key Features:

USB can be any type of device
AVR processor, 16 MHz
Single pushbutton programming
Easy to use Teensy Loader application
Free software development tools
Works with Mac OS X, Linux & Windows
Tiny size, perfect for many projects
Available with pins for solderless breadboard
Very low cost & low cost shipping options

Teensy Loader Application

The Teensy Loader makes getting code into your Teensy easy. Just press and release the reboot button and the processor runs the HalfKay bootloader, which is automatically detected. Teensy Loader lets you download your code and reboot to it.

Automatic mode downloads and reboots to your code the instant your computer detects HalfKay. The latest version of your code is always used. Just press the button and within 1 to 2 seconds your latest code is running!