hdmi 2.1 cable is complies with the HDMI 2.1 standard and is the highest version currently in the world. Compared with the previous version hdmi 2.0, its transmission speed has made a qualitative leap, directly from 18Gbps to 48Gbps. What's more, The HDMI 2.1 cable contains and upgrades all the functions of the previous HDMI version, and is fully compatible with HDMI 2.0b/2.0a/2.0/1.4/1.3/1.2/1.1 version.