--Support Mirror & Extend Dual Mode:
1.Dual output: This adapter can extend up to 2 screens at the same time.
2.HDMI output scales up to 1920 x 1080 @60Hz. It supports all HDMI / VGA interface video display devices.
-- NOTE --
1.Confirm the system of your computer/laptop is Windows7/8/10,it does not work for other systems(Linux,Chrome OS).
2.Check your usb port if it is loose or not,and change another port to try.
3.If found it can't convert high quality pictures on your monitor, please check if you plug the adapter on a USB3.0 port of your computer or not.
4.If your computer/laptop have USB 2.0 port only, DON'T BUY this adapter. It does also works USB 2.0 port, but for USB 2.0 port the max resolution support 800*600 only.
5.Both HDMI and VGA output supports VIDEO to monitor/HDTV. HDMI also supports AUDIO output, but VGA doesn't have that capability.