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

Why don't PCs come with only USB-3 ports? usb 3 slot Leading quality standard of Ultra Durable™ 3 technology with 2oz copper PCB design · Supports newest NEC SuperSpeed USB with superfast transfer rates of up usb c slot This becomes especially important when the device you wish to charge or use requires a USB port, and the device you want to use only has a

usb slot I have an older Lenovo ThinkCentre with several USB ports, none of which are USB 3 compatible When I checked my device manager I found