TRENDnet TK-423K

The TRENDnet TK-423K is four port USB and PS/2 KVM switch with audio switching. It is a slightly more advanced version of the TK-409K, adding more indicators, a sturdier design, and PS/2 compatibility.

As a trade off for PS/2 compatibility, the TK-423K requires a power adapter, and is not powered over USB. On the bakc of the device there are four VGA inputs, each with a microphone and speaker input. There is one set of VGA and microphone outputs, and then USB and PS/2 keyboard and mouse ports that connect to the shared console controls. The mouse is emulated, so only the KVM switch itself needs to be plugged into the mouse. There are slector buttons on the device to control which computer is being output, and the audio ports can be selected independently of the keyboard, video and mouse. All required cabling is included, and the hardware can be used with any mouse compatible operating system.