Allows one computer to easily access two parallel printers. It allows bi-directional communications, and operates power-free. Supports parallel printers including Bi-tronics and centronics, but not inkjet printers. Provides push button or hot key for printer selection. Includes software driver and works with DOS, Windows 3.1x, 98/98SE, ME, 2000 and XP systems. Recommended cables: CC405D DB25 Male to Male. (Connectors: 3 DB25 Female)