4K HDMI KVM & USB, RS232 , IR, Audio over IP Extender HKM02B-4K Datasheet Manual CAD CAD FeatureResolution up to 4K@30Hz 4:4:4Signal extension up to 150M over CAT5e (or greater), 60KM over fiber optic cable.Workable with Ethernet switches for HDMI extension, distribution, switching, and matrix.Built-in loop out, an extra local HDMI display at TX side.Built-in 4 USB ports for remote control.Supports up to 8 x 16 video wall.Supports video scaler, 4K to 1080p/ 1080p to 4K.Supports HDMI audio embedding and extraction function.Supports USB, full-duplex RS232, bi-directional IR, analog audio transmission.Supports RS232 signal distribution.Managed via Windows based software, Android/iOS APP, Web GUI, IR remote, panel pushbutton, Telnet API, RS232 console.