I print the 'labels', cut them to size, then attach to the appropriate device with double sided sticky tape.
Alternatively, you could attach plain paper to your device, then write on it with a felt tip marker pen.
The way I store my lenses can make identifying them challenging, so I labeled all my end caps. Chargers also get a label, marking the camera that they belong. I also add labels to my various cables so when it is time to move them around I don't have to trace them back.
Yes, they are self adhesive. Paper labels with a gloss finish. Multiple size and types of font, double line, cable modes (prints the sam thing twice, and adheres to itself to make a tag for a cable. has symbols, if you so desire.
Paper can be different colors. I chose white, but you can get all kinds of colors. Look up AZE tape on Amazon and you'll see tons of color choices. Multiple styles like bold, italic, shadow, outline.
Runs off 3 AAA batteries or you can get an AC adapter. I've had this thing for almost 3-4 years now and have never replaced the batteries.