Holiday Shipping Details & Extended Holiday Returns 
4K HDMI KVM Switch 4 in 1 out Quad Multiviewer supports 4 Computers share 1 Monitor, Keyboard, Mouse or other USB devices at the same time
Hotkey Notes:
1. Keyboard shortcut replacement: (The following shortcut key "Scroll lock" can be replaced with Ctrl / CapsLock / NumLock according to personal habits)
scroll lock + scroll lock + "Ctrl / CapsLock / NumLock " + Enter
2. Single screen control switching for USB devices:
1) scroll lock + scroll lock + 1/2/3/4
2) numeric keypad * + 1/2/3/4 (Simultaneously press)
3) Switch to the front / back screen of the current control screen: Press the mouse wheel + left / right mouse button (Simultaneously press)
Follow the above hotkey to choose which computer that the USB devices is controlling when multi HDMI sources showing on 1 monitor.
3. On/Off multi-screen keyboard-and-mouse crossing mode:
scroll lock + scroll lock + F12
Crossing mode allows keyboard and mouse cross between HDMI sources, which means you can control max 4 computer at the same time.
4. Multi screen synchronous control mode:
numeric keypad * + 0 (Simultaneously press)
Synchronous control mode means the USB devices will operate multi HDMI sources with the same way at the same time.
5. Restore factory settings:
scroll lock + scroll lock + ESC / R
