The VOPEX DVI/HDMI USB KVM splitter with built-in USB hub allows up to four users (four USB keyboards, USB mice and DVI/HDMI monitors) to access one USB computer and up to three USB devices (printers, scanners, security cameras, etc.).</p><p><strong>Control Modes:</strong></p><p>Press Mode button to cycle through all four modes. LEDs indicate which mode is selected. <br />User 1 Mode - Only User 1 can type or move the mouse. <br />User 2 Mode - Only User 2 can type or move the mouse. <br />User 3 Mode - Only User 3 can type or move the mouse. <br />User 4 Mode - Only User 4 can type or move the mouse. <br />Inst Mode - Keyboard or mouse activates immediately. <br />Delay Mode - Locked out user must wait five seconds after last keystroke or mouse movement occurs on active user. </p>