4 computers share one set of keyboard, mouse and monitorThis KVM switch has 4 group ports for 4 computers, each group port consist of one HDMI port and one USB-A 3.0 port.Please plug HDMI cable and USB cable together. HDMI is used to transmit audio, USB is used for power supply and data transmission.Only 1 HDMI 2.0 cable provided, please prepare the rest 4 HDMI cables by yourself. Please use HDMI 2.0 cable to achive 4K@60Hz resolution.Please update the USB driver of your computer if the keyboard and mouse doesn't work.Switch way: physical button control and wired remote control, not support keyboard hotkey switch way.