You can use the USB ports to charge your Quick Keys, plug the wireless dongle for the Quick Keys in,  or to plug in a thumb drive to download some images you are working on. 

[1,2] The image to the right shows the two USB ports on top of the Pen Display 24 to the right and left of the power On/Off button.

The image to the right is taken from the Pen Display 24 Quick Start Guide on our website.

The entire Quick Start Guide can be viewed using the below link, and there is also a downloadable PDF for your convenience.