kIOUSBHostConnectionSpeedCount The number of available connection speed values. DeclarationkIOUSBHostConnectionSpeedCount See AlsoGetting the Connection SpeedskIOUSBHostConnectionSpeedNonekIOUSBHostConnectionSpeedFullkIOUSBHostConnectionSpeedLowkIOUSBHostConnectionSpeedHighkIOUSBHostConnectionSpeedSuperkIOUSBHostConnectionSpeedSuperPluskIOUSBHostConnectionSpeedSuperPlusBy2