there is an automatic monitoring function to monitor the operation of the host LED to monitor status It sounds a beep when the port is No software required Supports SVGA, VGA and Multi-Sync Monitors LED displays monitor status No external power is needed Computer port: 4 Console Port: 3 USB port: 7 Compatible computers: 4 Keyboard emulation: USB Mouse emulation: USB Keyboard input/output: USB. Mouse Input/Output: USB VGA Input/Output: D-Sub 15 High Density LED Indicators: 4 Compatibility: DOS, Win 3.X, Windows 95/98 / 98SE / ME / 2000 / XP / Vista, WinNT, Netware, Unix, Share USB devices such as USB printer, USB scanner, USB flash drive, USB hub and etc ... This KVM switch can control multiple PCs from one keyboard, mouse and VGA monitor. It has keyboard and mouse emulation for PC simultaneous boot process. Cables (not included) Connection: connect VGA from computer A to PC1, VGA from computer B to PC2 Connect the mouse / keyboard / USB printer to the 3 USB console ports connect computer USB cable A to USB1, computer B USB cable to USB2 Colour: black. Material: ABS Size: 15 x 6 x 2.3 cm Package contents: 1 x Converter Only the above package content, other products are not included. Please note: Different lighting conditions and screen settings may cause the colour of the item in the picture to look a little different from the real thing. The allowed measurement error is +/- 1-3 cm.