What does RO5 indicate on 9001KR9R05 operator?

Issue:
What is the difference between the 9001KR9R and 9001KR9R05?

Product Line:
30mm, 9001K9R. 9001K, 9001SK Operators

Environment:
Push Buttons and Operator Interface

Resolution:
The R05 indicates a red knob with "Push Emergency Stop" printed on the knob. Knob part number 9001R2205.

Released for: Schneider Electric USA