Do I have to plug the KeepKey into a computer in order to use it?
The KeepKey is USB-powered, and does not have a battery. It must be connected to a computer in order to be used.

How does the KeepKey connect to my computer?
The KeepKey has a Micro-B USB connector, and it connects to your computer with a USB cable that is provided.

Can my KeepKey go through metal detectors and airport scanners?
KeepKey stores its private keys on flash memory, which is safe to put through metal detectors and airport scanners without being damaged. There is metal in the KeepKey, however, and it will set off metal detectors.