Szalinski 3-IDer

Wayne invented the 3-IDer to win an inventors' contest. The 3-IDer projects a holographic image around the user which lets the person effectively disguise as another. Wayne thought that undercover police work and witness protection would also benefit from it.

Theft by Klounberg
After the criminal Klounberg realised what a potential the invention had, he stole it and commited crimes disguised as Wayne.

Other uses
Because his children built another 3-IDer after it was stolen, Wayne was able to confront Klounberg while disguised as Chief McKenna. The resulting explosion during the confrontation reverted everyone back to their normal shape, except the real chief who was transformed into a woman wearing a bikini during the explosion.

Trivia

 * The voice of the user doesn't change.
 * The 3-IDer seems to not just project a hologram around the user, it seems to change the actual physical shape of a person, e.g. when Klounberg as Wayne is grabbed by the chief.