Thick USB cable. Easier to grab, less of a knot factory than a thread-thin cord.
Skinny cables vanish. They knot. They feel like they will snap if you look at them wrong.
Chubby Cable is the same job — charge the phone — with a jacket thick enough to grab in a dark bag. It is a small quality-of-life thing. That is the point.
Plug it in like any USB cable — No app. No pairing.
Leave it where you actually charge — Nightstand, desk, car — the bulk makes it stay visible.
