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$249.99
$269.97
Kidde Hardwired Smoke & Carbon Monoxide Detector, 10-Year Battery Backup, Voice Alerts, Interconnectable LED Warning Light Indicators, 4 Pack
Amazon.com
167
Free shipping
$249.99
$269.97
Kidde Hardwired Smoke & Carbon Monoxide Detector, 10-Year Battery Backup, Voice Alerts, Interconnectable LED Warning Light Indicators, 4 Pack
Amazon.com
167
$24.90
$29.99
First Alert Smoke Alarm, 10-Year Sealed Battery Detector With Test & Silence Button, SMI110, 1-Pack
Amazon.com
7K+
16% off
$24.90
$29.99
First Alert Smoke Alarm, 10-Year Sealed Battery Detector With Test & Silence Button, SMI110, 1-Pack
Amazon.com
7K+
$44.99
$59.99
System Sensor 2WT-B Photoelectric Smoke Detector With 135 Degree Thermal
Amazon.com
54
Free shipping
25% off
$44.99
$59.99
System Sensor 2WT-B Photoelectric Smoke Detector With 135 Degree Thermal
Amazon.com
54
$211.09
System Sensor D4120W Duct Smoke Detector (24/120V), D4120W | Supplyhouse.Com
SupplyHouse.com
9
$211.09
System Sensor D4120W Duct Smoke Detector (24/120V), D4120W | Supplyhouse.Com
SupplyHouse.com
9
$142.71
System Sensor D4120 4-Wire Duct Smoke Detector, 4-Wire, Photoelectric, Low-Flow (24/120V), D4120 | Supplyhouse.Com
SupplyHouse.com
1
$142.71
System Sensor D4120 4-Wire Duct Smoke Detector, 4-Wire, Photoelectric, Low-Flow (24/120V), D4120 | Supplyhouse.Com
SupplyHouse.com
1
$268.79
Trane Sen01789 Smoke Detector Sensor - Photoelectric - Probes & Sensors
Parts Town
$268.79
Trane Sen01789 Smoke Detector Sensor - Photoelectric - Probes & Sensors
Parts Town
$554.79
Lennox 22H56 Single Sensor Smoke Detector Kit - Supply & Return Air Applications - Probes & Sensors
Parts Town
2
$554.79
Lennox 22H56 Single Sensor Smoke Detector Kit - Supply & Return Air Applications - Probes & Sensors
Parts Town
2
$141.99
$235.56
SYSTEM SENSOR System Sensor D4120 4-Wire Photoelectric Low-Flow Duct Smoke Detector 24VDC / 120VAC Replaces DH100ACDCLP
Voomi Supply
1
39% off
$141.99
$235.56
SYSTEM SENSOR System Sensor D4120 4-Wire Photoelectric Low-Flow Duct Smoke Detector 24VDC / 120VAC Replaces DH100ACDCLP
Voomi Supply
1
$206.79
Trane Sen01639 System Sensor - Duct Smoke Detector - Universal - Probes & Sensors
Parts Town
$206.79
Trane Sen01639 System Sensor - Duct Smoke Detector - Universal - Probes & Sensors
Parts Town
$255.21
SYSTEM SENSOR D2 2-Wire Photoelectric Duct Smoke Detector, Photoelectric Sensing, Early Smoke Detection
Voomi Supply
$255.21
SYSTEM SENSOR D2 2-Wire Photoelectric Duct Smoke Detector, Photoelectric Sensing, Early Smoke Detection
Voomi Supply
$8.49
Smoke And Other Flammable Gases Sensor Module, 0-10,000 Ppm, Analog And TTL Level Output
L-com Global Connectivity
$8.49
Smoke And Other Flammable Gases Sensor Module, 0-10,000 Ppm, Analog And TTL Level Output
L-com Global Connectivity
$251.95
RSZ1-FSA SIEMENS - Fire Safety & Smoke Detector Supplies
Radwell.com
$251.95
RSZ1-FSA SIEMENS - Fire Safety & Smoke Detector Supplies
Radwell.com
$131.84
PE-11 SIEMENS - Fire Safety & Smoke Detector Supplies
Radwell.com
$131.84
PE-11 SIEMENS - Fire Safety & Smoke Detector Supplies
Radwell.com
$37.97
Hardwired And 10-Year Battery Backup Smoke Detector With Ionization Sensor
Home Depot
In store
34
Free shipping
Curbside
$37.97
Hardwired And 10-Year Battery Backup Smoke Detector With Ionization Sensor
Home Depot
34
$1,795.09
500-086501 SIEMENS - Fire Safety & Smoke Detector Supplies
Radwell.com
$1,795.09
500-086501 SIEMENS - Fire Safety & Smoke Detector Supplies
Radwell.com
$179.92
SYSTEM SENSOR DUCTSD Smoke Detector, 4-Wire Photoelectric, Easy Plug-In Installation
Voomi Supply
$179.92
SYSTEM SENSOR DUCTSD Smoke Detector, 4-Wire Photoelectric, Easy Plug-In Installation
Voomi Supply
$24.73
$44.97
Universal Security Instruments USI/SM/HW10YR/P Hardwired And 10-Year Battery Backup Smoke Detector With Photoelectric Sensor And Voice Alert
PrairieGrit
14
45% off
$24.73
$44.97
Universal Security Instruments USI/SM/HW10YR/P Hardwired And 10-Year Battery Backup Smoke Detector With Photoelectric Sensor And Voice Alert
PrairieGrit
14
$109.73
Edwards Sd-2Wpcb Smoke Dectector Sensor Kit
Gordon Electric Supply
$109.73
Edwards Sd-2Wpcb Smoke Dectector Sensor Kit
Gordon Electric Supply
$32.47
10-Year Battery Powered Smoke Detector With Photoelectric Sensor 21031466
Home Depot
417
Free shipping
$32.47
10-Year Battery Powered Smoke Detector With Photoelectric Sensor 21031466
Home Depot
417
$29.97
10-Year Battery Powered Smoke And Fire Detector With Ionization Sensor
Home Depot
47
Free shipping
$29.97
10-Year Battery Powered Smoke And Fire Detector With Ionization Sensor
Home Depot
47
$41.99
$59.99
X-Sense Combination Smoke And Carbon Monoxide Detector Xp0a-Sr
eBay
30% off
$41.99
$59.99
X-Sense Combination Smoke And Carbon Monoxide Detector Xp0a-Sr
eBay
$34.95
$68.99
Carbon Monoxide Detector CO Smoke Monitor Alarm
Until Times Up
49% off
$34.95
$68.99
Carbon Monoxide Detector CO Smoke Monitor Alarm
Until Times Up
$39.95
Honeywell ASD-PL3 Intelligent Photoelectric Smoke Sensor NEW
RES LLC Store Main
$39.95
Honeywell ASD-PL3 Intelligent Photoelectric Smoke Sensor NEW
RES LLC Store Main
$149.56
System Sensor 1151 Ion / Ionization Smoke Detector Head Free Fast
eBay
Free shipping
$149.56
System Sensor 1151 Ion / Ionization Smoke Detector Head Free Fast
eBay
Free shipping
$92.00
Fire-Lite Sd355 Photoelectric Smoke Detector Fast Shipping
eBay
1
Free shipping
$92.00
Fire-Lite Sd355 Photoelectric Smoke Detector Fast Shipping
eBay
1
$74.77
$100.94
X-Sense 10-Year Battery Smoke Detector, Mini Fire Smoke Alarm With Photoelectric Sensor, LED Indicator Silence Button, XS03 Pack Of 2
vyroqi.com
25% off
$74.77
$100.94
X-Sense 10-Year Battery Smoke Detector, Mini Fire Smoke Alarm With Photoelectric Sensor, LED Indicator Silence Button, XS03 Pack Of 2
vyroqi.com
$208.00
FIRELITE HONEYWELL SD365-IV Intelligent Photoelectric Smoke Sensors
Keyless Access Locks
$208.00
FIRELITE HONEYWELL SD365-IV Intelligent Photoelectric Smoke Sensors
Keyless Access Locks
$70.23
$106.74
Kidde KN-COSM-IBA Hardwire Combination Smoke/Carbon Monoxide Alarm With Battery
mihomemy
34% off
$70.23
$106.74
Kidde KN-COSM-IBA Hardwire Combination Smoke/Carbon Monoxide Alarm With Battery
mihomemy
$13.56
BRK 1046836 SMI100-AC Interconnectable Ion Smoke Alarm W/ Battery Backup | Supplyhouse.Com
SupplyHouse.com
8
$13.56
BRK 1046836 SMI100-AC Interconnectable Ion Smoke Alarm W/ Battery Backup | Supplyhouse.Com
SupplyHouse.com
8
$48.50
System Sensor 2W-B 2-Wire Photoelectric i3 Smoke Detector
BSA Security Integrators
148
$48.50
System Sensor 2W-B 2-Wire Photoelectric i3 Smoke Detector
BSA Security Integrators
148
$74.40
System Sensor SS-PHOTO SS-Series Photoelectric Smoke Detector
BSA Security Integrators
30-day returns (most items)
$74.40
System Sensor SS-PHOTO SS-Series Photoelectric Smoke Detector
BSA Security Integrators
30-day returns
$19.88
First Alert 9120B 120V AC/DC Hardwired With 9V Battery Backup Ionization Smoke Alarm (Upgraded To SMI100-AC)
Electric Bargain Store
29
$19.88
First Alert 9120B 120V AC/DC Hardwired With 9V Battery Backup Ionization Smoke Alarm (Upgraded To SMI100-AC)
Electric Bargain Store
29
$19.88
BRK Electronics First Alert 9120B 120V AC/DC Hardwired With 9V Battery Backup Ionization Smoke Alarm (Upgraded To SMI100-AC)
Electric Bargain Store
5
$19.88
BRK Electronics First Alert 9120B 120V AC/DC Hardwired With 9V Battery Backup Ionization Smoke Alarm (Upgraded To SMI100-AC)
Electric Bargain Store
5
$66.74
Kidde 21031514, Smoke And Carbon Monoxide Alarm, Detects Smoldering Fires And/Or CO Hazard, Photoelectric And Electrochemical Sensors, Battery
1000Bulbs.com
44
$66.74
Kidde 21031514, Smoke And Carbon Monoxide Alarm, Detects Smoldering Fires And/Or CO Hazard, Photoelectric And Electrochemical Sensors, Battery
1000Bulbs.com
44
$12.98
BRK Electronics First Alert FG250B 9V DC Battery Operated Ionization Smoke Alarm (Upgraded To SMI100)
Electric Bargain Store
$12.98
BRK Electronics First Alert FG250B 9V DC Battery Operated Ionization Smoke Alarm (Upgraded To SMI100)
Electric Bargain Store
$67.18
Low Profile 10 Year Combination Photoelectric Smoke & Carbon Monoxide Alarm
Northern Safety Co., Inc.
$67.18
Low Profile 10 Year Combination Photoelectric Smoke & Carbon Monoxide Alarm
Northern Safety Co., Inc.
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    Shop smoke sensor

    Sponsored
    About our ads
    $249.99
    $269.97
    Kidde Hardwired Smoke & Carbon Monoxide Detector, 10-Year Battery Backup, Voice Alerts, Interconnectable LED Warning Light Indicators, 4 Pack
    Amazon.com
    167
    Free shipping
    $249.99
    $269.97
    Kidde Hardwired Smoke & Carbon Monoxide Detector, 10-Year Battery Backup, Voice Alerts, Interconnectable LED Warning Light Indicators, 4 Pack
    Amazon.com
    167
    $24.90
    $29.99
    First Alert Smoke Alarm, 10-Year Sealed Battery Detector With Test & Silence Button, SMI110, 1-Pack
    Amazon.com
    7K+
    16% off
    $24.90
    $29.99
    First Alert Smoke Alarm, 10-Year Sealed Battery Detector With Test & Silence Button, SMI110, 1-Pack
    Amazon.com
    7K+
    $44.99
    $59.99
    System Sensor 2WT-B Photoelectric Smoke Detector With 135 Degree Thermal
    Amazon.com
    54
    Free shipping
    25% off
    $44.99
    $59.99
    System Sensor 2WT-B Photoelectric Smoke Detector With 135 Degree Thermal
    Amazon.com
    54
    $211.09
    System Sensor D4120W Duct Smoke Detector (24/120V), D4120W | Supplyhouse.Com
    SupplyHouse.com
    9
    $211.09
    System Sensor D4120W Duct Smoke Detector (24/120V), D4120W | Supplyhouse.Com
    SupplyHouse.com
    9
    $142.71
    System Sensor D4120 4-Wire Duct Smoke Detector, 4-Wire, Photoelectric, Low-Flow (24/120V), D4120 | Supplyhouse.Com
    SupplyHouse.com
    1
    $142.71
    System Sensor D4120 4-Wire Duct Smoke Detector, 4-Wire, Photoelectric, Low-Flow (24/120V), D4120 | Supplyhouse.Com
    SupplyHouse.com
    1
    $268.79
    Trane Sen01789 Smoke Detector Sensor - Photoelectric - Probes & Sensors
    Parts Town
    $268.79
    Trane Sen01789 Smoke Detector Sensor - Photoelectric - Probes & Sensors
    Parts Town
    $554.79
    Lennox 22H56 Single Sensor Smoke Detector Kit - Supply & Return Air Applications - Probes & Sensors
    Parts Town
    2
    $554.79
    Lennox 22H56 Single Sensor Smoke Detector Kit - Supply & Return Air Applications - Probes & Sensors
    Parts Town
    2
    $141.99
    $235.56
    SYSTEM SENSOR System Sensor D4120 4-Wire Photoelectric Low-Flow Duct Smoke Detector 24VDC / 120VAC Replaces DH100ACDCLP
    Voomi Supply
    1
    39% off
    $141.99
    $235.56
    SYSTEM SENSOR System Sensor D4120 4-Wire Photoelectric Low-Flow Duct Smoke Detector 24VDC / 120VAC Replaces DH100ACDCLP
    Voomi Supply
    1
    $206.79
    Trane Sen01639 System Sensor - Duct Smoke Detector - Universal - Probes & Sensors
    Parts Town
    $206.79
    Trane Sen01639 System Sensor - Duct Smoke Detector - Universal - Probes & Sensors
    Parts Town
    $255.21
    SYSTEM SENSOR D2 2-Wire Photoelectric Duct Smoke Detector, Photoelectric Sensing, Early Smoke Detection
    Voomi Supply
    $255.21
    SYSTEM SENSOR D2 2-Wire Photoelectric Duct Smoke Detector, Photoelectric Sensing, Early Smoke Detection
    Voomi Supply
    $8.49
    Smoke And Other Flammable Gases Sensor Module, 0-10,000 Ppm, Analog And TTL Level Output
    L-com Global Connectivity
    $8.49
    Smoke And Other Flammable Gases Sensor Module, 0-10,000 Ppm, Analog And TTL Level Output
    L-com Global Connectivity
    $251.95
    RSZ1-FSA SIEMENS - Fire Safety & Smoke Detector Supplies
    Radwell.com
    $251.95
    RSZ1-FSA SIEMENS - Fire Safety & Smoke Detector Supplies
    Radwell.com
    $131.84
    PE-11 SIEMENS - Fire Safety & Smoke Detector Supplies
    Radwell.com
    $131.84
    PE-11 SIEMENS - Fire Safety & Smoke Detector Supplies
    Radwell.com
    $37.97
    Hardwired And 10-Year Battery Backup Smoke Detector With Ionization Sensor
    Home Depot
    In store
    34
    Free shipping
    Curbside
    $37.97
    Hardwired And 10-Year Battery Backup Smoke Detector With Ionization Sensor
    Home Depot
    34
    $1,795.09
    500-086501 SIEMENS - Fire Safety & Smoke Detector Supplies
    Radwell.com
    $1,795.09
    500-086501 SIEMENS - Fire Safety & Smoke Detector Supplies
    Radwell.com
    $179.92
    SYSTEM SENSOR DUCTSD Smoke Detector, 4-Wire Photoelectric, Easy Plug-In Installation
    Voomi Supply
    $179.92
    SYSTEM SENSOR DUCTSD Smoke Detector, 4-Wire Photoelectric, Easy Plug-In Installation
    Voomi Supply
    $24.73
    $44.97
    Universal Security Instruments USI/SM/HW10YR/P Hardwired And 10-Year Battery Backup Smoke Detector With Photoelectric Sensor And Voice Alert
    PrairieGrit
    14
    45% off
    $24.73
    $44.97
    Universal Security Instruments USI/SM/HW10YR/P Hardwired And 10-Year Battery Backup Smoke Detector With Photoelectric Sensor And Voice Alert
    PrairieGrit
    14
    $109.73
    Edwards Sd-2Wpcb Smoke Dectector Sensor Kit
    Gordon Electric Supply
    $109.73
    Edwards Sd-2Wpcb Smoke Dectector Sensor Kit
    Gordon Electric Supply