USB 2.0 4 -to-1 Auto printer Sharing Switch allows multiple PCs to share one USB Printer devices for FIRST COME, FIRST SERVICE. Compatible USB 1.1/2.0 Specifications Supports both UHCI and OHCI USB interface USB B-Type corresponds to computer and USB A-Type connects to USB device. No extra power required. The Application Software makes switch between multiple computer easier The Icon displays on the task bar as device status monitors Auto Printer sharing detection is available