Spatial armband

The spatial armband is a device created by both Miles Prower and Cobar.

When Miles suspected the timeline of being altered, he invented the armband to prevent his family from being erased. Around the same time, Lien-Da forced Cobar to make her an armband before he was supposedly killed. (StH: #166)

Five years later, after Shadow had been released from suspended animation, he ripped off Lien-Da's armband so that she would change place in the timeline. (SU: #7)