USB Port on Keyboard

I remember reading somewhere that there is a limitation as to what you can plug into the USB port on the Apple keyboard that comes with the iMac. Can anyone confirm this? Is the keyboard USB port USB2? Can I use a memory card reader in this port?
Thanks

Keyboard USB ports are low-power USB 1.1. USB 2.0 devices may work, but at 1.1 speeds. Devices that tend not to work are those that need to be powered from the USB port; whether a memory card reader would work I can't say not having tried one.

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