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The camera model you have doesn't have a flashing light. You would need a DS-2CD2347G2-LSU/SL for that function.I have DS-2CD2347G2-LU Colorvu camera installed and I cannot see the option for flashing alarm light output either logged into the NVR or the camera direct.
My NVR is DS-7608NI-K2/8P not sure if that makes a difference
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