Every time you buy a new device, you wind up with a new power adapter. They collect under desks, behind PCs, and in boxes in the closet. It's almost as if they're breeding. It’s easy to lose track of which one goes to which device, and it’s possible to harm your gear by using the wrong power cable. So the first thing you should do after buying new gear is to label the power brick, permanently pairing it with the right device.