"Well, yes, but it is, as I say, a special stick. The sharpest Cleaver blade couldn’t cut through this. Probably. I’ve trained you in stick-fighting. Tanith trained you in staff-fighting. All you have to do to turn the stick into a stun baton is press your thumb against this symbol here."
[…]
“There you go,” Skulduggery said. “On its first time out, it just needed a few moments to warm up. It recharges itself just by being in contact with your skin. The shock it delivers is enough to incapacitate an average-sized person. Don’t worry, the effects aren’t permanent. They’ll wake up with a headache, nothing more.”
“Well,” she said grudgingly, “I suppose that’s pretty cool. So where do I keep it? Do I get a scabbard or do I have to carry it around with me?”
“Neither,” he said, taking something from his pocket. It was a small disc, no bigger than a contact lens. He motioned to her to turn round, then he pressed it into her jacket near her shoulder blade. “Think of this as a kind of magnet,” he said. “Go on. Put the stick away.”
She moved the stick over her shoulder and let go when she felt the pull. The stick stayed there, tight against her back. She reached for it, pulled it loose, and returned it to her back. It slapped in and didn’t move. “Nice,” she said.