The 4-Port USB (Universal Serial Bus) PS/2 KVM Switch Kit with Audio (TK-423K) provides control of 4 computers/servers with just one set of console controls. Manage 4 computers that have open VGA & PS/2 ports at the touch of a button with one set of PS/2 or USB (Universal Serial Bus) keyboard & mouse, VGA monitor, microphone & speakers. Independent audio/mic & PC port selection provide additional flexibility. LED indicators show connection status & a buzzing sound confirms port switching. With Hot-Plug, Auto-Scan & Hot-Key operating features, this versatile device is the perfect choice for managing 4 computers/servers. Please note: networking components such as switches, routers, UPS & wireless devices require that speeds & standards be consistent throughout the network to gain optimum performance. To avoid compatibility clashes or for advice, please contact us on solutions@ebuyer.com.