C1-10P's spark projector.
A spark projector was a tool carried by military-grade astromech droids during the Clone Wars and the time of the Galactic Empire. They could fire a concentrated bolt of electricity that had the potential to short-circuit electronics and electrocute a human to unconsciousness. It could also be used to unlock binders. Three years before the Battle of Yavin, the astromech droid named "Chopper" used his spark projector to free AP-5 from his restraining bolt, as well as electrocute an Imperial officer to render him unconscious.[1]
Appearances
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Sources
"The Forgotten Droid" Episode Guide | Star Wars Rebels on StarWars.com (backup link)- Star Wars Helmet Collection: Ezra Bridger Weapons & Uniforms: The Lothal Rebels