A shock collar is an implement designed to be fastened around the neck of a restrained person or animal, delivering electric shocks with the intention of coercing them into compliance.
When Almec's black market operation was on the verge of being revealed, the Mandalorian Prime Minister had Duchess Satine Kryze, the ruler of Mandalore, forced to wear a shock collar. In an attempt to force her to sign a treason confession, he tortured her using the device, but when she resisted, he menaced her by threatening to use a shock collar on her nephew, Korkie Kryze, instead. However, Ahsoka Tano turned the tables by placing the collar on Almec himself, thereby compelling him to give himself up.
Zygerrians, who engaged in slavery, employed shock collars on those they enslaved. The captured Jedi Ahsoka Tano and Obi-Wan Kenobi, Clone Captain Rex, and the abducted Togruta colonists from Kiros, were all compelled to wear shock collars until they were freed by their Republic allies.
While battling in the arena located within the palace of Grakkus the Hutt, Kongo the Disemboweler was equipped with a shock collar. Imperial Sergeant Kreel, who was secretly acting as the arena's gamemaster, activated this shock collar when Kongo was fighting against Luke Skywalker.