Set of 3 "PANIC" Buttons by Safety Technology International, Inc.
Blue MEDICAL EMERGENCY, 
Yellow PLANT EVACUATION, 
White WEATHER WARNING

Interface connector on back side:
SHAN-HO
Type SHA-S801A/B
General Use
6A 600V AC
1A 250V DC

Two of the buttons include partial wiring with 8 position DIP switch

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