Settings - Reminders

The reminders page allows you to change the settings for each level of reminder.

The allow notification option allows you to turn off the reminders for all items assigned to this priority level.
When enabled, the alarm option causes the reminder to have an audible alarm which you can choose from the line below. If you turn this off, the reminder will not make any sounds to alert you to it.
If your device has a vibrate option, you can enable the vibrate mode and select one of the vibration patterns from the line below it.
The option to wake up sleeping devices allows your device to be more precise as to when it runs the reminder. This option does consume more battery power when it is turned on.
Snooze allows you to customize the length of time you can snooze your reminder.