4 USB devices A switch that allows one set of USB mouse, USB keyboard, and monitor to be shared between two PCs. The active PC is easily identifiable at a glance. - Model: USB Switch Selector - Function: 2 in 4 Out USB Sharing Switch Box - Compatibility: Compatible with most USB devices - Applications: Office, control room, shopping mall, educational use - Design: Compact and simple design Thank you for viewing. I purchased this by mistake and have left it untouched for a long time. I only remember opening the package, so it's practically unused.