8K@60Hz USB 3.0 HDMI KVM Switch 4 Port, MT-KH804 Using only ONE set of keyboard, mouse and ONE monitor to control FOUR computer devices. With 4 USB 3.0 hub port, it is possible to connect bar code scanner, USB hard drives or other USB devices to KVM. Support resolution up to 8k@60Hz, 4K@60/120/144Hz, 2K@165Hz,1080@240Hz. Support Windows/Vista/XP and Mac Os, Linux and Unix ,Plug and Play. Support HDMI 2.1 & HDCP 2.3, 4:4:4 Aluminum Alloy Shell 1. Protective 2. Durable 3. Excellent 8K Vision 1, High performance chip, more stable 2, True 8K transmision 3, More widely Compatibility 4 USB 3.0 Hub USB 3.0 offers data transfer speeds of up to 5Gbps while USB 2.0 offers data transfer speeds of only 480Mbps. Package 1x 8K HDMI KVM Switch 4 Port 1x Power Cable (Power adapter not included, if power insufficient, pls plug in DC5V1A USB adapter) 4x USB 3.0 Cable 1x Desktop Controller 1x User Manual ***Noted: 8K HDMI Cable are not included, pls use verify HDMI cable, 8K@60Hz is recommended*** FQA: 1, What is the approximate total cable length supported by the input and output hdmi ports? We recommend input and output can't exceed 2.5m (8.2ft) respectively, total can't exceed 5m. 2, Why does the screen turn black for 2-3s when switching? When the input channel is switched, the product will read and write the EDID again, resulting in a black screen. The specific time depends on the computer speed and the response time of the display. 3, After connecting the 8K HDMI cable into the kvm, but no display, why? If you would like to output 8K@60Hz, 4K@120Hz and 1080P@240Hz via the switcher in your displays, please make sure your source devices, your cable and your monitors can all support the resolution and refresh rate you need to output before.