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== A "Hi-Speed USB 2.0 device" versus a "USB 2.0 device" ==Although low speed and full speed existed in the USB 1.1 specification, the USB 2.0 specification added Hi-Speed while maintaining support for low speed and full speed.:• Low speed, up to 1.5 Mbps:• Full speed, up to 12 Mbps:• Hi-Speed, up to 480 Mbps{||-! Type of Host Controller! USB Device Speeds Supported|-| USB Enhanced Host Controller (EHCI)| USB Universal Host Controller (UHCI)| USB Open Host Controller (OHCI)| -| Hi-Speed| Full speed and low speed| Full speed and low speed|} Motherboards that support USB 2.0 must have at least one USB enhanced host controller and usually one or more UHCI or OHCI controllers to support full speed and low speed devices.