Impeccable product, easy to install and use. It allows you to switch between 2 PCs, both DVI outputs as mice and keyboards (I-cons said Orliewan) Indeed there is only one PC USB port but it can manage at the same time keyboard and mouse. Ditto for the sound input and output. The "switchage" is possible by using the switch box is set by a keyboard key. The switch of the screen and the audio switch are differentiated, basically it is possible to work on a PC and listen to music from another PC. Possible distance between 2 pc (about 2m)