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What are the degrees of protection (IP) of the Harmony XB4 and XB5 control and signaling units?

The pushbuttons and LEDs are IP66  The selector switches are IP69K. 
The IP rating can be improved by adding covers, which increases the protection index to IP69K.
  • Push button single boots ZBP
  • Double-Heared push button boots ZBW or ZBA7
  • Mushroom headed Buttons ZBZ
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