Control up to four 4 USB equipped computers with only one monitor, USB keyboard and mouse! Monitor, keyboard, mouse, microphone and speakers are directly connected to the ports of the switch.; If needed, you can connect a USB hub to the switch, so that other USB devices, such as Pen Drives, USB hard drives, card readers, etc. can be connected and you will have access to the devices with USB 1.1 speed when switching between computers.; Speakers and microphone can be excluded from being switched by using Windows or Mac software; Switching between the two connected PC's can be done in several ways:; via keyboard hotkey: 2 x Scroll Lock key; via switch button on top of the switch; via KVM Switch software and the icon on the taskbar (Windows) or dock (Mac); via Hotkeys: 'Ctrl + Alt + []', [] are the keys 1-4 ;