Smoke and Heat Detector FT-143 Relay output 4-wire With base smoke heat compound fire detection system [FT-143] - $11.00 : China top brand burglar and fire alarm systems, New technology burglar and
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Kidde Firex Hardwired Inter-Connectable 120-Volt Auxiliary Heat Detector 135 Degree with Battery Backup 21029895 - The Home Depot