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Hi Marshall, thank you for your question. We apologize for this. X800H doesn't support features specified in the HDMI 2.1 standard like the 4K120, eARC, VRR, and ALLM. There is much confusion about the HDMI versions and concerns about compatibility. For this reason, we do not promote the HDMI versions incorporated on many of our products. Instead of HDMI version numbers, we advertise the features of a product that are associated with a particular HDMI version. ~Earl
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