This little shield protects the power button on the Cintiq Companion from being pushed. Quit often I find myself accidentally pushing this button while manipulating my Companion. Even when I putt this in the messenger bag that I bought for the Cintiq. It just takes a little consistent pressure to turn it on or off. I know that you can actually disable the button, but I actually like that button where it is. The designers just should have made a bump out or recessed the button to keep it out of the way. Anyway, for those of you out there who have the same issue and have a printer, this should do the trick.