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The USB 3.0 to Dual HDMI Multi-Monitor Adapter is designed to extend or mirror your computer's display to two additional HDMI monitors via an available USB Type-A 3.0 port. Make sure you are connecting the adapter to a USB 3.0 port on your Dell Inspiron 3670 desktop. USB 3.0 ports are recommended for optimal performance. Verify that both HDMI monitors are powered on and set to the correct input/source corresponding to the HDMI ports connected to the adapter.
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