Hi Sir/Madam

How to connect ELK-150RT siren to 2GIG-GCX Panel?

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Do I need to switch off 2GIG-GCX panle first as it is connected to security service?
RED(+) wire I can connect to (1) ?
BLACK(-) wire I can connect to (2) ?

There are 2 White loop wire to BELL or OPEN COLL and GND?

Thanks for any help
Arun