??This version is optimized on the MEGA2560 R3 development board. It not only ensures that it is completely consistent and compatible with the original version, but also facilitates everyone's use. ?Operating Voltage: 5V ; Input: Voltage (recommended):7-12V ??Using a high-speed microprocessor controller (ATmega2560-16U2)and compatible driver ?CH340G?chip, the development interface and environment are very simple and easy to understand, making it ideal for beginners to learn ??Completely solve the incompatibility and instability of traditional Nano boards on win7 and win8 systems. ?? CH340G chip Driver?http://www.wch-ic.com/download/list.asp?id=126