The personal alarm can be set for any time, using any future date.
As long as both the computer and JAWS For Windows are running, when the alarm is designated to activate, a message window will pop up using the message you specified when the alarm was created. An optional default alarm sound, or an unlimited number of custom alarm sounds, can also be assigned to each alarm individually.
The custom chime is great for marking the passage of time with an auditory signal, a time announcement, or a series of auditory signals and time announcements. For example, the chime can be set to sound at the beginning of every hour, every half hour, or every quarter hour; Custom time intervals can also be set.