This is a 4-in-1-out ultra-high-definition KVM extender switch, comprises a transmitting end and a receiving end. It supports 4 HDMI™ signal inputs and 1 HDMI™ signal output, the 4K@60Hz HDMI™ signal can be extended to 70 meters through CAT6 or above network cable, the highest resolution is 4K@60Hz and is backward compatible, supports KVM control. A variety of control methods (IR remote control, button and RS-232) can easily switch the content of the 4 HDMI™ signal sources to the display. The product is widely used in security monitoring, education and training, exhibitions and broadcasting, command centers, etc.