The carrot pen resembles a carrot, typical of other carrots seen in Zootopia, with green leafy decoration, perhaps doubling as a clicker. There is also a clip for attaching to clothing, a button on the side to record, and a speaker which plays back the recording. The pen likely works similarly to other, generic pen recorders, and Judy puts it to good use in recording confessions and other revelations.
Role in the Film
The carrot pen serves an important role throughout the film.The first time it is used is when Nick Wilde states that he has made $200 every day since he was twelve - a statement which implicates him in felony tax evasion.
Judy uses this as a way to effectively blackmail Nick into helping her multiple times, including when she originally asks Nick for the last known whereabouts of Emmitt Otterton, in order to convince him to help her search for the plate number of Emmitt's limousine at the Department of Mammal Vehicles, and finally as a way to enter the premises of the limousine company owned by and principally operated for Mr. Big.
After the missing mammals have been found, Judy gives Nick the pen along with a ZPD application so he can join.
After Judy returns to apologize to Nick, he records her apology as his way of showing he accepts it. Finally, with the revelation that Bellwether has been orchestrating the missing mammal incidents and cases of savageness around Zootopia, Judy and Nick record her confession on the pen, resulting in her arrest, impeachment and incarceration by the ZPD and the end of hostilities between predators and prey in Zootopia.
It is last seen at the end of the film in Judy's possession when Judy and Nick catch Flash Slothmore speeding.
Role in Media