Neuroshock is a program that can electrocute organic creatures. It has variable settings. "Lethal" is probably a poor choice of words - it's intended to be so, but it rarely kills its target outright, and generally must be combined with other forms of damage to finish someone off. It has a range of three meters, lasts for nine seconds, and paralyzes the enemy, doing moderate damage. The wiki says that it also permanently lowers the target's accuracy, which I assume is a result of damaged coordination, and does actually wear off, although it likely takes several hours to a day to do so.