DTECH 4 Port VGA Switch Box 4 in 1 Out Video Switcher for up to 4 PCs Share 1 Monitor 1920 x 1440 Resolution VGA switch 4 input 1 output box for 4 computers sharing 1 monitor or switching between dual monitors from a single computer Up to 500MHz bandwidth supported for HD video clarity and high resolutions up to 1920x1440 Small analog video switcher enclosed in a metal case with two push button for convenient manually changing SVGA signal Compact 4 in 1 out VGA ab switch is with DDC2 function to automatically adjust screen resolution when using different monitors plug and play, no need to shut off the switch to connect or disconnect your laptop; no power needed