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You need to use the HDMI USB cable that comes with in the HDMI box to connect any USB-A port or any USB-A adapter (Does not include USB adapter in box). TVs, monitors, projectors, etc. all have usb-A ports. The HDMI USB cable is 1.5 feet. Why we need use this HDMI USB cable? It is necessary to connect the HDMI USB cable since some HDMI slots (most cameras such as GoPro 7 Black) cannot provide enough power for the fiber optic HDMI cable at some time. The HDMI fiber optic cable is an active cable, it needs enough power to work properly. If the power is insufficient, there will be a black screen, screen flicker, no signal and other problems.