Product advantages: 1. USB PCIe card has built-in SINEFINE power supply control technology with up to 25W charging power, fast charging for devices that support PD 2.0/3.0, BC 1.2 and AFC charging protocols. (For optimal PD performance, connect an external 6-pin power outlet, which requires a separate power supply） 2. Add 4 ports on the desktop through the PCI Express slot, each port has a maximum data transmission speed of 5Gbps to achieve a fast connection. 3. Internal USB card from mother board though a PCI Express Slot-Ensure stable connection and lost few data transfer speed. Do't have lost device connection issue like external USB HUB does. 4. Added on USB 3.0 card will not use CPU USB Main Lan, will just add a 1+ USB 3.0 lane 5Gbps bandwidth on mother board, will not speed down the USB 3.0 main lane. 5. PCI Express 3.0,2.0,X1 Interface：PCI Express 2.0 standard with PCIE X1 interface will compatible with PCIE 4.0/3.0/2.0/1.1 standard. Compatible with PCIE X1,X4,X8,X16 slot. 6. Easy to install：1.Turn off the computer power, then remove the cover from the computer case.2.Find the corresponding PCI-E card slot.3.Insert the card into a empty PCI Express slot.4.Lock the screw. NOTE: 1. Please make sure the power has been disconnected before installation. 2. The card is suitable for standard size (about 12CM) computers and doesn't apply to low-profile/mini/half-height PC（didn't come with a half-height bracket）. 3. The actual transfer speed of the card may be limited by the connected device. 4. Install the driver after the computer recognizes the card, otherwise the installed driver will be invalid. 5. It is recommended that you uncheck the option of "Allow the computer to turn off this device to save power" in the "Device Manager" of your PC when using the USB card (perform the same operation for each "USB ROOT HUB").