The is compatible with for IDE and most shields designed for the r3.The chip is Atmega2560-16au and Atmega16u2, same with the version.Improved and expert version: 1. 0 pinout: added SDA and SCL pins that are near to the AREF pin and two other new pins placed near to the RESET pin, the IOREF that allow the shields to adapt to the voltage provided from the board. In , shields will be compatible both with the board that use the AVR, which operate with 5V and with the Due that operate with 3. 3V. The second one is a not connected pin, that is reserved for purposes.Stronger RESET circuit. Use 5. 5 x 2. 1mm DC barrel (compatible with 5. 5 x 2. 5mm DC barrel )It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with an AC-to-DC adapter or battery to started.Type: TFT color screen moduleScreen size: 3.5 inchesScreen resolution: 320X480 (pixels)Screen Type: TFTPower supply: 5V/3.3Vcolor:BlueMaterial:PCBPackage Contents:1 x LCD Screen1 x Data Cable1 x Development BoardOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.