The stop watch, featured in the season 2 finale, is a watch with the ability to stop time. Josie used the watch for various personal purposes and to steal the chi-gong ball from Victor. Josie accidentally breaks the watch and gets stuck in time.
Josie's clone also has a similar watch with the ability to stop time. It is unclear if all observers are issued such watches or if it is just her. These types of watches affect everyone except The Janitor.