1. 4 Port KVM Switches: 4 computers sharing one set of keyboard & mouse, 4 monitors, 1 USB 2.0 peripheral. With audio & microphone output, with 1 USB 2.0 hub, with all input cables. Support HDMI 2.0, HDCP 2.2, HDR 10, EDID. Windows won?t move during switching between computers. 2. 4K KVM Switch USB: We are certified HDMI adopter over 10 years. Excellent image processing and transmission capacity, make the output signal is more smooth and steady. Drive-free for Windows 10/7/2000/XP/Vista, Linux, Mac, Debian, Ubuntu, Fedora, Raspbian, Ubuntu, etc. 3. 3 Port KVM Switch 4K: Max resolution up to 4096x2160@60Hz, compatible 3840x2160@60Hz and lower resolution. With a DC5V 2A power adapter, power supply more stability. Support wired/wireless keyboard mouse, support Apple keyboard(Hot Key is changeable). 4. USB KVM Switch HDMI 4 Port: Four switching way optional: Hotkey switching(NumLock + NumLock + 1 / 2 / 3 / 4 + Enter, or Ctrl + Ctrl + 1 / 2 / 3 / 4 + Enter , or ScrollLock + ScrollLock