Product Spotlight: Siemens OP121, DB-11

Laura gives us the lowdown on the Siemens OP121 Conventional Photoelectric Smoke Detector.

• SIEMENS OP121: https://firealarm.com/product/siemens-op121/
• SIEMENS DB-11: https://firealarm.com/product/siemens-db-11/

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