• the Teensy is a breadboard-friendly development board with loads of features in a, well, teensy package. The Teensy 2.0 breaks out all of the IO available on the ATMEGA32U4 to breadboard-friendly 0.1" spaced headers so you can hook up a load of peripherals.
• The Teensy 2.0 comes pre-flashed with a bootloader so you can program it using the on-board USB connection: No external programmer needed! You can program the Teensy in your favorite IDE using C or you can install the Teensyduino add-on for the Arduino IDE and write Arduino sketches for Teensy!
• Features:
• 8-Bit AVR Processor 16 MHz (ATMEGA32U4)
  31.5K Flash Memory, 2.5K RAM, 1K EEPROM
  USB Can Emulate Any Type of Device
  Single Pushbutton Programming
  Arduino Compatible
  12 Analog Inputs
  25 Digital I/O Pins
  7 PWM outputs
  SPI and I2C

Package includes:

1PCS Teensy 2.0 USB development board AVR MKII ISP download cable AT90USB162