What is the HDMI input for on Xfinity box?
On the back, the Flex has two HDMI ports. One is an HDMI Input, which you can use to host another video source — chances are you will never use this port. The other, labeled HDMI TV, is the one you use to connect it to a display. What is the HDMI in port for on Xfinity box? HDMI (High …