Yangtian S710 Win7 operating system how to achieve dual-screen display replication and expansion

Symptom:
Yangtian S710 Windows 7 operating system how to achieve dual-screen display for replication and expansion.
Solution:
The S710 has a rear HDMI OUT video output interface that can be dual-displayed when connected to an HDMI display.
After installing the graphics card driver, use the Win+P key combination directly under Windows 7 to adjust the output mode.
Copy mode:

Extension:

Extension function cannot be implemented.
S760 is the same as the S710, dual screen can be copied and expanded, but keep in mind, HDMI OUT, VGA IN video input and output.