It has the appearance of a ray-gun and Billy Billions' B logo.
Anyone affected by this ray is physically stuck in a particular age until the effect is reversed. In Ben and Rook's case, it was age 11. However the victim's mind is still at the same mental age before being de-aged.
It was confiscated by Ben and Rook and used to return them to their proper ages.
Ben 10: Omniverse
- Arrested Development (first appearance)