In Robert Jordan
's world of The Wheel of Time
, a device
used to control a woman
who can channel
. These consist of a collar
connected to a bracelet
by a leash
. They work by creating a link
between the two women connected, but one with a strange form of feedback
in which one can induce extreme pain
in the other. The Seanchan
use these to control all women naturally strong enough in the One Power
to learn to channel on their own, without being taught.
If a man who can channel merely touches an a'dam while it is being worn by a woman who can channel, he suffers intense pain and she suffers a rather unpleasant feeling.