Features: No software control, you can select the host computer to be operated by the button Support for hot-swappable, do not need to turn off the KVM switch and the computer can plug in or unplug the connected computer Support for smart mouse and so on There is automatic monitoring function for monitoring the host running KVM switches are typically used by one or more administrators to manage multiple computers or an environment where users must operate two or more computers, including network operations centers, information centers, server rooms, software development, Test labs, service centers, departmental LANs, and desktops install multiple computers simultaneously. Specifications: Item: 4-Port Manual KVM Switcher Size: approx 10x7.5x2.3cm/3.93x2.95x0.90in Resolution up to:1920 x1440 Bandwidth: 250MHz Material:ABS Support :SVGA, VGA, and Multi-sync Monitors Computer Port: 4 Console Port:3 USB Port: 7 Computers Supported: 4 Keyboard Emulation: USB Mouse Emulation: USB Keyboard Input / Output: USB Mouse Input / Output: USB VGA Input / Output: High Density D-Sub 15 pin LED indicators: 4 Support DOS, Win3.X Win95 / 98 / 98SE / 2000 / ME / XP, WinNT, Netware, Unix, Linux Connection: connect VGA of computer A to PC1, VGA of computer B to PC2 connect USB mouse/keyboard/printer to the 3 USB console ports connect USB cable from computer A to USB1, USB cable from computer B to USB2 Note: This product does not bring their own power cord, you need to purchase the power of the line need to be purchased separately, (a host needs to connect a power cord, then two hosts need to connect two power lines and so on) Power port USB male (B type) that is common printer data cable Please allow 0-1cm error due to the manual measurment. Package includes: 1 x KVM Switcher