This is a connector cable that allows you to connect two PCs and use them like one, with the mouse moving between them. The main unit only, there is no manual, so please refer to the internet. It's just a matter of connecting and running the software, so there shouldn't be any difficult operations. PC Smart Bridge II (PC SMART BRIDGE Ⅱ), a USB connection cable, approximately 1.5m long, black. - Brand: BUFFALO - Model Name: BSKM203 - Type: USB connection - Features: PC Smart Bridge II - Color: Black - Length: Approximately 1.5m Thank you for viewing.