The magical bracelet was first introduced in The Wizards Return: Alex vs. Alex.
Description[]
It appears to be a regular bracelet with colored glass charms attached to it.
People who were trapped in the charms:
The Wizards Return: Alex vs. Alex[]
In the movie, Evil Alex uses that bracelet to capture all of Alex's friends and family to use as leverage so that she would perform a spell to rid the world of humans. Alex has no choice but to do as they say, but eventually she secures the bracelet and saves the day.