04/18/2023
Laura gives us the lowdown on the Siemens OP121 Conventional Photoelectric Smoke Detector.
Siemens OP:121: https://firealarm.com/product/siemens-op121/
Siemens DB-11: https://firealarm.com/product/siemens-db-11/
$6.69
$14.39
$58.99
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