These televisions have at least 1 HDMI 2.1 input, which allows you to benefit from many new functions. HDMI 2.1 is the latest HDMI version and offers a larger bandwidth than its predecessors. This allows you to view images with the 4K resolution and a refresh rate of 100Hz, for example. This is how images look detailed and smooth. On televisions with older HDMI 2.0 ports, you can view the 4K resolution with a refresh rate of up to 50Hz. Do you use an audio system via an AV receiver next to your TV? You use eARC, an improved version of ARC, with an HDMI 2.1 cable, which you receive and send audio signals of even higher quality with. This way, you can listen to Dolby Atmos sound or other surround sound formats from your soundbar or audio system.