Nagito frowns. "Ah--well, Hinata-kun could explain it if he were here, but--not that I want him to be here-- I'll do the best I can, but it's not going to be exact."

Nagito pulls off his jacket, revealing the t-shirt underneath and, more pointedly, the place not far below his elbow where his prosthetic ends. There are also long, ragged scars from some sort of toothed blade, but Nagito ignores those.

"A lot of the movement is mechanical. You can hear it." He wiggles his fingers exaggeratedly to make the whirring louder. "But I control it with my mind, the same as I control my other arm, via electrical impulses. That's far, far beyond someone like me to explain the details of, but the whole human body works like that, so it's sort of hijacking systems that already exist."