And that's just the stuff that makes a good-faith effort to the specs. My wife bought me an LED light panel for Christmas so I wouldn't be so grouchy in the winter (gift for me or her: you decide).
It uses a USB mini connector for a 19.whatever volt power supply. Don't plug that into your external HDD by mistake.
Yes, I know USB mini is obsolete, but we still own a couple devices that use it. And the plug is stamped with the USB logo.