The Trendnet TK-407K KVM 4-port USB switch kit is a practical solution for anyone who uses more than one computer, as it can be used to simultaneously control up to 4 PCs with just one keyboard, one mouse and one monitor! The Trendnet TK-407K switch kit also has several useful functions such as audio warnings and shortcut keys to make switching between computers even easier. This kit even includes cables that also serve to power the TK-407K so you dont need a separate mains adapter. The TK-407K is compatible with the majority of operating systems.