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What does the additional suffix ``7`` on ZB2B or ZB4B operator reference number mean?

Issue:
What does " 7 " suffix mean on a ZB4 part number?

Product Line: 
22mm Harmony push Buttons

Environment:
North American Products

Resolution:
The ``7`` added to the catalog number means this switch comes with a black metal bezel instead of a chrome metal bezel.
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