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What does a flashing green LED mean on a OAC-DT sensor?

The green LED is for ultrasonic detection. When the LED is  flashing it is indicating that it is sensing movement with the ultrasonic sensor. For more information please click on the link below:

 

http://www.cooperindustries.com/content/dam/public/lighting/controls/products/documents/greengate/spec_sheets/oac_dt_low_spec_sheet.pdf