Canon RM-Lite Administrator's Manual page 44

Specify the Event Priority
Change the priority depending on the event type using
[Event Priorities] in the [Events] tab. E-mail notification is
performed according to the specified priorities.
Click or drag the slider for each event to change the
priority.
The priority can be set to one of the following five levels:
Level Value
Highest
High
Medium
Low
Lowest
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Color
Red
Orange
Yellow
Light Green
Green