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HDMI 1&2 are capable of 4K/144Hz or 1080p/288Hz, and HDMI 3&4 are capable of 4K/60Hz. To improve flexibility, we have the eARC port on HDMI 4, meaning you can connect 2 advanced gaming systems up and still have one port available to connect to an external soundbar or sound system. Hope this helps! Thank you, TCL Customer Support
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