How to identify USB 2 and USB 3 ports on a computer

How to identify USB 2 and USB 3 ports on a computer usb 2 0 slot With native PCI Express EHCIOHCI USB host controller, this board is driver free under Windows, MAC and Linux operation system and best compatible with usb 20 slot I want to buy an external USB drive and I wonder how to figure out whether my laptop has such a port Neither lsusb -v

usb 20 slot If what I understand is correct, PCIe x1 has a speed of 500 MBs which is comparable to USB speeds A USB card that is limited to

usb slot extender x and specifications provide a 5 V supply on a single wire to power connected USB devices A unit load is defined as 100 mA in USB , and USB Type A Connectors, Receptacle , USB , Through Hole, 8 Contact, 2 Port, A, 30 V, Right Angle, PCB Mount, -, Tray USB Connectors Micro B Skt,