TRENDnet TK-208K

The TRENDnet TK-208K is a 2-port PS/2 KVM switch kit with both VGA and PS/2 connections to your computers and comes with an audio device.

The TK-208K allows you to control two multimedia computers with just one keyboard, monitor, mouse, microphone, and set of speakers, making it ideal for managing multiple PCs.

This unit comes with the hot-plug feature, which lets you add a PC or remove the connected PC without powering down the KVM switch or the other PCs. There is no other software that is required, as you can switch between the PCs with the Push Button or the other hot-key commands.
This model is related to the TRENDnet TK-205K, which is also a 2-port PS/2 KVM switch but it does not have the audio device and comes with a handy beeping sound to let you know when you have switched properly.