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A neuralyzer, sometimes spelled as neuralizer, is a device seen in the Men in Black franchise. It is one of the signature tools and considered standard issue employed by the Men in Black. It is a device about the size of an average cigar tube that gives a bright flash which erases the memories of the past hours, days, weeks, months or years, depending on the chosen settings.

A neuralyzer wipes the memory of a target or witness, putting them under a hypnotic state, making them susceptible to suggestion and implantation of false memories, used by MiB as a moral substitute to witness elimination while still retaining their existence or/and alien presence on Earth unknown to the public. The length of memory erased can be changed using buttons and dials. There are different neuralyzer models with different button and dial configurations. These buttons or dials can be set accordingly to the amount of time needed to be forgotten, and it can be set to minutes, hours, days, months and years. The device produces a noisy, camera-like flash. The agents implant new memories in place of the old ones.

(Wikipedia)