This PCI Express based 12V Powered USB (Universal Serial Bus) Card means that you can add three Powered USB (Universal Serial Bus) (USB Plus Power) ports to any standard form-factor sized computer, using an available PCI Express Slot. Drawing power from either the PCI Express slot or the computer power supply, the powered USB (Universal Serial Bus) adapter card provides up to 3A of current to each connected device, allowing for up to three Powered USB (Universal Serial Bus) devices to be installed at the same time. Plus, the PCI Express Powered USB (Universal Serial Bus) Adapter card can be connected to the corresponding accessory daughter board PUSBADAP (2 Port Low Profile 12V/24V Powered USB (Universal Serial Bus) Adapter Card), to create two additional Powered USB (Universal Serial Bus) ports, but does not require a second PCI Express slot.