Mega 2560 R3 for Arduino + USB Cable / Mega 2560 R3 Atmega2560-16au Board (Compatible with Arduino)(cheap,but Not for Beginners,replace the 16u2 (Usb Chip),you Need to Download the USB Driver From Our Web Site) 1.Can be used in win 7 and win 8 2.Increased needle socket, convenient you use dupont line. 3.Please note that Replacing the 16u2 makes the cost reduced to half, consumers obtain maximum benefits 4.Since replacing the 16u2 (usb chip), it is cheap, but you need to download the USB driver from our web site, so it is not very suitable for beginners, while it is also not so hard, which is worth a try. 5.Arduino project launched using ATMEGA8U2, ATMEGA16U2 version of the product is have their own ideas, in the vast majority of applications, the USB interface chip only as a serial port and communication of "flash". With professional and the usb chip, not only can reduce the cost, and good application