The VM7824 is a True 4K HDMI input board that works with an ATEN Modular Matrix Switch to offer an easy way to route 4 HDMI audio/video sources to 4 displays with True 4K high-definition images support. In addition to the HDMI interface that carries digital A/V signal, the VM7824 also provides 4 stereo audio input ports that enable stereo audio embedding. True 4K Resolutions – handles uncompressed video resolutions up to 3840 x 2160 / 4096 x 2160 @ 60Hz (4:4:4). Cable Quality Tester – examines the HDMI cable quality.