A De-Neuralyzer is a special device that reverses the effects of a Neuralyzer. Although a neuralyzer is operated by a small flash of light, a de-neuralyzer is much more complicated. There are only two known De-Neuralyzers in existence. The first is the one in the MiB, and the second is in the basement of Jeebs' pawn shop. Jeebs' De-Neuralyzer was taken off of the Internet, and was even more complicated. Jeebs' machine acted like Rube Goldberg Machine, and even after that, the effects were not instant. With Jeebs' machine, it takes several minutes for a subject's memory to return. According to Jeebs, this is because he doesn't have updated software for the device that otherwise would allow immediate return.