The Raspberry Pi Official Keyboard is not only a great value, it adds 3 available USB 2.0 ports to your Pi. It's compatible with all Pi models including Zero series boards!
The official keyboard includes three host USB ports for connecting external devices, such as USB mice, USB drives, and other USB-controlled devices.
The product’s micro USB port is for connection to the Raspberry Pi. Via the USB hub built into the keyboard, the Raspberry Pi controls and provides power to, the three USB Type-A ports