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What is the difference between XB4/XB5 and ZB4/ZB5?

Issue:
What is the difference between the XB4 and ZB4 parts and the ZB5 and ZB5 parts? 

Product Line:
Harmony Pushbuttons

Environment:
All Products

Cause:
Product Features

Resolution:
XB indicates a complete device and ZB is components.
While the 4 indicates the metallic line, and the 5 indicates the plastic line. 

An XB4 part number will be a complete metallic 22 mm operator. 
A ZB4 part number is a metallic component. 

An XB5 part number will be a complete plastic 22 mm operator. 
A ZB5 part number is a plastic component. 
 
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