Fire Warning Sensor Sensitive Stability Belt Relay Smoke Detector Fire Alarm Switch Smoke Sensor Module - Instrument Parts & Accessories - AliExpress
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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
Siemens DB-X11RS Detector Base W/Relay P/N: 500-096125 - Rybb Fire Alarm