HDMI 2.1 is the latest version of HDMI. HDMI 2.1 cables are also called ultra high speed cables. Thanks to the large bandwidth and the support of many useful functions, you can enjoy the latest image techniques that your TV or monitor supports with an HDMI 2.1 cable. For example, HDMI 2.1 can send images in 8K resolution, so you can see details in razor sharp images. HDMI 2.1 also offers ARC and eARC, which allows you to receive and send high-quality sound signals such as Dolby Atmos between devices. Note: in order to use these functions, you also need HDMI 2.1 support in the devices you connect, in addition to the good cable.