Manhattan Firewire 400 PCI Express Card - 2 Port Ext (160353) Easily adds two FireWire 4 ports to desktop computers Each port supports data transfer rates of up to 4 Mbps Low-profile form factor fits PCI Express x1, x2, x4, x8 and x16 lane buses 12 V DC connector uses bus power to recharge and supply connected FireWire devices Plug and Play installation; Windows and Mac compatible