A 30m HDMI cable with 4K support is designed for long-distance transmission of high-definition audio and video, often requiring an active optical cable (AOC) to maintain signal integrity over this distance. Key features include 4K resolution (4096 x 2160) at high refresh rates like 60Hz, support for HDR (High Dynamic Range), and features like Ethernet, Dolby TrueHD, and DTS-HD. These cables connect devices such as PCs, laptops, gaming consoles, and projectors, providing high bandwidth and reliability for home theaters and professional setups