A stun charge was an electrical shock emitted by a shock-filament. A person stepping on a shock-filament would suffer from a intense electrical charge, sufficient enough to pass through any footwear—insulated or otherwise—into the offender. The charge was powerful enough to render a Wookiee unconscious, and repeated shocks could kill a Human.
Xufal D'uat adapted cells in his ship, Venom Sting, with shock-filaments that could unleash stun charges on his prisoners. This customization was to the liking of later owners of the ship, a team of Thalassian slavers.