Slave collar

The Slave Collar is a Collar used by the Slavers from Paradise Falls. It has 1 weight and 0 value and cannot be removed from the inventory due to being a quest item. Due to glitches you may have extra collars that become permanent weight. It is said that the collars send out a frequency to Paradise Falls and keep track on where every collar is located. The Collar is equipped with explosives and is set off as soon as a Slave tries to escape.

Grouse keeps track of all Collars.

The Player Character receives a Slave Collar and a Mesmetron for use in the Quest Strictly Business.

Glitches

 * An unknown glitch may occur during the Strictly Business quest in which Grouse will present the player more than one collar at a time.
 * By talking to any of the VIP slaves after enslaving them, and telling them to "deal with [being a slave]", Grouse will reward the player again and give the player another collar.

Related Quests
Strictly Business

Trivia
The slave collar is actually two separate items: the quest item given to the player by Grouse, and a hidden apparel item that is generated on NPC's that the player enslaves. The Player can wear the latter by typing the following into the game console: "player.additem 0002F563 1" to add a collar to your inventory (it won't show up on the pipboy), and then "player.equipitem 0002F563" to equip it. To remove it, type "player.removeitem 0002F563".

The Mesmetron was similar to the Persuadatron from the Syndicate game series, going as far to even being named similar. The Persuadatron on the other hand allowed complete domination over a victim without the need of a Slave Collar.

The idea of an exploding Slave Collar is featured in quite a few movies and novels. Such as:
 * The Running Man,
 * Wedlock, also widely known as Deadlock,
 * Battle Royale and Battle Royale 2: Requiem.