Abstract: Restraint devices which have a first bracelet, a second bracelet, and a central holder. In one embodiment, the central holder contains a one-way locking mechanism and a retraction/extension mechanism. In a second embodiment, the central holder comprises a retraction/extension mechanism. One end of a line is attached to the second bracelet and the other end of the line is attached to the retraction/extension mechanism, which urges the second bracelet toward the central holder. When the first bracelet is open, the line may be extended from the central holder or retracted to the central holder. When the first bracelet is closed, the retraction/extension mechanism is engaged, causing the one way locking mechanism/one way clutch to allow retraction of the bracelet toward the central holder, but to prevent extension of the bracelet away from the central holder. A line stopper is disclosed which connects with the line between the retraction/extension mechanism and the second bracelet.