Dell E-Series Legacy Extender Docking Station PR04X Designed to work with legacy hardware such as a PS/2 keyboard or mouse, or a printer with a parallel port. 2 x USB 2.0, 2 x PS2 Port 1 x Serial RS-232 port, 1 x Parallel Port Compatible with the Lattitude E - series (E4200 - E6530); and the XT3 Also Compatible with the Precision M-Series (M2400 - M6700); and the Vostro A90 V13 Series