Chip model is AT90USB1286, ARV microcontroller software development and learning the best experimental board, has been installed Bootloader program, you can directly download the application code through the common USB interface, very helpful for beginners. Method of use: teensy.exe can be downloaded directly from the Internet, no need to install the driver, direct erase, program, check. Do not need to buy another expensive burner. At the same time, you can use for Arduino IDE to install the Teensy development environment for use. Key Features: USB can be any type of device AVR processor, 16 MHz Single pushbutton programming Easy to use Teensy Loader application Compatible for Arduino Works with Mac OS X, Linux & Windows Tiny size, perfect for many projects Colour: green + black Material: metal + plastic Size: development board about 51x18mm Package Contents: 3 x Teensy 2.0 ++ USB AVR Development Board 3 x Line Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.