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Safety Equipment and GearAlarm SystemsAll Home SecurityAll Tool SetsBathroom HardwareBathroom PlumbingBLACK+DECKERCar Emergency SuppliesCarbon Monoxide AlarmsDimmers, Switches, and Wall PlatesDoor HardwareDoor Security HardwareDoorbellsElectrical ToolsElectronic Communication ComponentsEmergency SuppliesEmersonFire SafetyFirst AlertFlashlightsFurniture HardwareGarage Door Openers and HardwareGarage Storage SystemsGate HardwareGatesGuttering & DrainageHand ToolsHome SafetyHome Safety by BrandHVAC Ducting and VentilationKiddeLight BulbsMailboxes and Mailbox AccessoriesMechanics ToolsPaint Supplies & ToolsPersonal PreparednessPersonal SafetyPlumbing Tools & AccessoriesPower ToolsSafety DetectorsSealants, Fillers and AdhesivesShop Plumbing by FixtureStorage ContainersStorm & Flood PrepSurveillanceThermostatsTool Equipment & StorageUniversal Security InstrumentsWater Heaters, Pumps & TanksWildfire Prep
Detectors(1000+)
Uses item details. Price when purchased online
X-Sense Smoke and Carbon Monoxide Detector Combo, 10-Year Battery, Standalone Alarm, Certified to Latest UL Standards, 3 PACK, SC06 From $42.99

Sponsored
From$4299
X-Sense Smoke and Carbon Monoxide Detector Combo, 10-Year Battery, Standalone Alarm, Certified to Latest UL Standards, 3 PACK, SC06
6174.6 out of 5 Stars. 617 reviews
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X-Sense Smoke and Carbon Monoxide Detector Combo, 10-Year Sensor with Digital Display, Standalone Alarm, Certified to Latest UL Standards, 5 PACK, SC01 From $42.99

Sponsored
From$4299
X-Sense Smoke and Carbon Monoxide Detector Combo, 10-Year Sensor with Digital Display, Standalone Alarm, Certified to Latest UL Standards, 5 PACK, SC01
504.4 out of 5 Stars. 50 reviews
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SITERWELL Hardwired Smoke & Carbon Monoxide Detector Combo,10 Year Battery,UL217-9th,Interconnected,Bilingual Voice Alerts,6.1in*1.65in.3 pack From $35.14

Sponsored
From$3514
SITERWELL Hardwired Smoke & Carbon Monoxide Detector Combo,10 Year Battery,UL217-9th,Interconnected,Bilingual Voice Alerts,6.1in*1.65in.3 pack
64.3 out of 5 Stars. 6 reviews
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SITERWELL Hardwired Interconnected Smoke and Carbon Monoxide Detector, 10 Year Product Life Alarm Smoke Carbon Monoxide Detector with 2 AA Batteries Back Up, Smoke and CO Detector Voice Alert,1 Pack From $54.99

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From$5499
SITERWELL Hardwired Interconnected Smoke and Carbon Monoxide Detector, 10 Year Product Life Alarm Smoke Carbon Monoxide Detector with 2 AA Batteries Back Up, Smoke and CO Detector Voice Alert,1 Pack
244.1 out of 5 Stars. 24 reviews
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Overall pick Kidde AA Battery Operated Basic Carbon Monoxide Alarm - 9CO5-LP3 $23.44

$2344
current price $23.44Kidde AA Battery Operated Basic Carbon Monoxide Alarm - 9CO5-LP3
5684.6 out of 5 Stars. 568 reviews
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LCD Display CO Carbon Monoxide Gas Detector Device Home Safety Alarm Detector From $13.99
From$1399
LCD Display CO Carbon Monoxide Gas Detector Device Home Safety Alarm Detector
354.7 out of 5 Stars. 35 reviews
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100+ bought since yesterday Kidde Battery-Operated Photoelectric Smoke Detector Alarm, 4-Inch, Batteries Included From $19.88

2 options
Available in additional 2 optionsFrom$1988
Kidde Battery-Operated Photoelectric Smoke Detector Alarm, 4-Inch, Batteries Included
8104.5 out of 5 Stars. 810 reviews
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100+ bought since yesterday Kidde Battery-Operated 4-inch Smoke Detector & Carbon Monoxide Value Pack, Batteries Included

3 options
Available in additional 3 optionsKidde Battery-Operated 4-inch Smoke Detector & Carbon Monoxide Value Pack, Batteries Included
7774.5 out of 5 Stars. 777 reviews
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50+ bought since yesterday First Alert SMI100 Battery-Operated Smoke Alarm, 1046827PT $16.99 $28.80/ea

$1699
current price $16.99$28.80/ea
First Alert SMI100 Battery-Operated Smoke Alarm, 1046827PT
1534.6 out of 5 Stars. 153 reviews
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100+ bought since yesterday Kidde AC Plug-In Carbon Monoxide Detector with Battery Backup, CO Alarm with LED Light Indicators From $27.47

3 options
Available in additional 3 optionsFrom$2747
Kidde AC Plug-In Carbon Monoxide Detector with Battery Backup, CO Alarm with LED Light Indicators
18324.7 out of 5 Stars. 1832 reviews
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(2 pack) Universal Security Instruments, Sensing Plus, Hardwired Smoke & Fire Alarm, Multi-Criteria Detection, with 10 Year Battery Backup $69.88 $34.94/ea

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$6988
current price $69.88$34.94/ea
From $34.94
(2 pack) Universal Security Instruments, Sensing Plus, Hardwired Smoke & Fire Alarm, Multi-Criteria Detection, with 10 Year Battery Backup
1214.2 out of 5 Stars. 121 reviews
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X-Sense Combination Smoke and Carbon Monoxide Alarm, 10-Year Battery Powered Detector, UL Certified, 1 PACK, XP0H-SN From $42.99

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From$4299
X-Sense Combination Smoke and Carbon Monoxide Alarm, 10-Year Battery Powered Detector, UL Certified, 1 PACK, XP0H-SN
1784.7 out of 5 Stars. 178 reviews
50+ bought since yesterday Kidde 10-Year Sealed Lithium Battery-Operated Photoelectric Smoke Detector Alarm, 5-inch From $34.97

2 options
Available in additional 2 optionsFrom$3497
Kidde 10-Year Sealed Lithium Battery-Operated Photoelectric Smoke Detector Alarm, 5-inch
3804.1 out of 5 Stars. 380 reviews
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X-Sense Smoke Detector Carbon Monoxide Detector Combo 10 Year Battery, Up to 24 X-Sense Link+ Wireless Alarms, SC01-W, 3-Pack From $119.69

2 options
Available in additional 2 optionsFrom$11969
X-Sense Smoke Detector Carbon Monoxide Detector Combo 10 Year Battery, Up to 24 X-Sense Link+ Wireless Alarms, SC01-W, 3-Pack
6314.5 out of 5 Stars. 631 reviews
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Smoke Alarm Detector Home Fire Safety Sensor Alert

Smoke Alarm Detector Home Fire Safety Sensor Alert
434.1 out of 5 Stars. 43 reviews
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SITERWELL Smoke Detector, Smoke Detector 10 Year Battery with Photoelectric Sensor, Fire Alarm with Low Battery and Fault Warning for House and Bedroom, UL217-9th Listed, GS525A, 2 Packs From $23.68

8 options
Available in additional 8 optionsFrom$2368
SITERWELL Smoke Detector, Smoke Detector 10 Year Battery with Photoelectric Sensor, Fire Alarm with Low Battery and Fault Warning for House and Bedroom, UL217-9th Listed, GS525A, 2 Packs
1984.4 out of 5 Stars. 198 reviews
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Smoke Alarm Home Security System Fire Protection Smoke Alarm Detector From $12.99
From$1299
Smoke Alarm Home Security System Fire Protection Smoke Alarm Detector
324.3 out of 5 Stars. 32 reviews
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Kidde Battery-Operated Photoelectric Smoke Detector Alarm, 4-inch, Batteries Included, 2 Pack From $36.88

2 options
Available in additional 2 optionsFrom$3688
Kidde Battery-Operated Photoelectric Smoke Detector Alarm, 4-inch, Batteries Included, 2 Pack
2814.5 out of 5 Stars. 281 reviews
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2PCS Smoke Alarm Detector Home Safety Sensor Alert From $17.79
From$1779
2PCS Smoke Alarm Detector Home Safety Sensor Alert
604.1 out of 5 Stars. 60 reviews
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Kidde Hardwired Photoelectric Smoke Detector Alarm, 10-Year Lithium Sealed Battery Backup From $35.97

2 options
Available in additional 2 optionsFrom$3597
Kidde Hardwired Photoelectric Smoke Detector Alarm, 10-Year Lithium Sealed Battery Backup
2343.7 out of 5 Stars. 234 reviews
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Zuomeng High Water Alarm for Sump Pump, Flashing Light & 110 dB Alarm, IP67 Casing, Connects to Submersible Pump $75.99

Sponsored
$7599
current price $75.99Zuomeng High Water Alarm for Sump Pump, Flashing Light & 110 dB Alarm, IP67 Casing, Connects to Submersible Pump
TOPTES Carbon Monoxide Detector with TFT Display CT-580, Rechargeable Handheld CO Inspection Device with Vibration, Visual and Audible Alarm, CO Detector for Home, Jobsite, Garage, and Travel $59.99

Sponsored
$5999
current price $59.99TOPTES Carbon Monoxide Detector with TFT Display CT-580, Rechargeable Handheld CO Inspection Device with Vibration, Visual and Audible Alarm, CO Detector for Home, Jobsite, Garage, and Travel
44 out of 5 Stars. 4 reviews
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SITERWELL Smoke Detector, Magnetic Fastening Kit, Smoke Alarm, Photoelectric ,Low Battery Warning Function, 1 Pack From $19.52

9 options
Available in additional 9 optionsFrom$1952
SITERWELL Smoke Detector, Magnetic Fastening Kit, Smoke Alarm, Photoelectric ,Low Battery Warning Function, 1 Pack
5604.4 out of 5 Stars. 560 reviews
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SITERWELL Smoke Detector 10 Year Battery Operated,Photoelectric,Rlectrochemical Sensors, Fire Alarm,Bilingual Voice Alerts, UL217-9th Standards,1 Pack From $24.80

3 options
Available in additional 3 optionsFrom$2480
SITERWELL Smoke Detector 10 Year Battery Operated,Photoelectric,Rlectrochemical Sensors, Fire Alarm,Bilingual Voice Alerts, UL217-9th Standards,1 Pack
254.7 out of 5 Stars. 25 reviews
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Kidde Battery Operated Carbon Monoxide Alarm with Digital Display KN-COPP-B-LPM From $27.94

3 options
Available in additional 3 optionsFrom$2794
Kidde Battery Operated Carbon Monoxide Alarm with Digital Display KN-COPP-B-LPM
7534.6 out of 5 Stars. 753 reviews
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TOPTES Carbon Monoxide Detector CT-300, Handheld CO Alarm with Backlit LCD Display and Audible Visual Alerts, for Home, Car, Camping and Travel $45.99

$4599
current price $45.99TOPTES Carbon Monoxide Detector CT-300, Handheld CO Alarm with Backlit LCD Display and Audible Visual Alerts, for Home, Car, Camping and Travel
234.5 out of 5 Stars. 23 reviews
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First Alert BRK SMI100-AC, Hardwire Interconnect Smoke Alarm with Battery Backup $19.81 Was $24.95

Now$1981
current price Now $19.81, Was $24.95$24.95
First Alert BRK SMI100-AC, Hardwire Interconnect Smoke Alarm with Battery Backup
684.7 out of 5 Stars. 68 reviews
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X-Sense Smoke and Carbon Monoxide Detector Combo, 10-Year Battery, Standalone Alarm, Certified to Latest UL Standards, 1 PACK, SC06 From $42.99

2 options
Available in additional 2 optionsFrom$4299
X-Sense Smoke and Carbon Monoxide Detector Combo, 10-Year Battery, Standalone Alarm, Certified to Latest UL Standards, 1 PACK, SC06
6174.6 out of 5 Stars. 617 reviews
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Universal Security Instruments Inc Sensing Plus, Smoke and Fire Alarm, Multi-Criteria Detection, with 10 Year Sealed Battery $27.97

$2797
current price $27.97Universal Security Instruments Inc Sensing Plus, Smoke and Fire Alarm, Multi-Criteria Detection, with 10 Year Sealed Battery
1644.6 out of 5 Stars. 164 reviews
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Rollback Outdoor-Forest Brand, Carbon Monoxide Detector, Orange Color, LCD Screen $24.37 Was $28.96

Now$2437
current price Now $24.37, Was $28.96$28.96
Outdoor-Forest Brand, Carbon Monoxide Detector, Orange Color, LCD Screen
1264.5 out of 5 Stars. 126 reviews
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SITERWELL Smoke Detector 10 Year Battery Operated,Photoelectric,Rlectrochemical Sensors, Fire Alarm,Bilingual Voice Alerts, UL217-9th Standards,1 Pack From $24.80

Sponsored
From$2480
SITERWELL Smoke Detector 10 Year Battery Operated,Photoelectric,Rlectrochemical Sensors, Fire Alarm,Bilingual Voice Alerts, UL217-9th Standards,1 Pack
254.7 out of 5 Stars. 25 reviews
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Zuomeng Smart Oil Gauge, Wi-Fi Heating Oil Tank Gauge with Detection Technology, Repeaters to Boost Signal, for 138-500 Gal Vertical/Horizontal Tanks $99.99

Sponsored
$9999
current price $99.99Zuomeng Smart Oil Gauge, Wi-Fi Heating Oil Tank Gauge with Detection Technology, Repeaters to Boost Signal, for 138-500 Gal Vertical/Horizontal Tanks
Fixdono Natural Gas Detector, Digital Sound Warning Gas Detector, Natural Gas Leak Security Detection Detector, Alarm Monitor Plug-in Sensor for Home Kitchen Restaurant Hotel School Warehouse $17.99 Was $31.99

Now$1799
current price Now $17.99, Was $31.99$31.99
Fixdono Natural Gas Detector, Digital Sound Warning Gas Detector, Natural Gas Leak Security Detection Detector, Alarm Monitor Plug-in Sensor for Home Kitchen Restaurant Hotel School Warehouse
2834.4 out of 5 Stars. 283 reviews
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Smoke Detector Home Security Sensor Alert Alarm From $13.39
From$1339
Smoke Detector Home Security Sensor Alert Alarm
114.1 out of 5 Stars. 11 reviews
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Kidde Battery-Operated Photoelectric Smoke Detector Alarm, 5-inch, Batteries Included From $29.97

2 options
Available in additional 2 optionsFrom$2997
Kidde Battery-Operated Photoelectric Smoke Detector Alarm, 5-inch, Batteries Included
1264.5 out of 5 Stars. 126 reviews
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First Alert 1046834, Electric Precision Detection Smoke Alarms $24.84

$2484
current price $24.84First Alert 1046834, Electric Precision Detection Smoke Alarms
1074.5 out of 5 Stars. 107 reviews
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BRK Hard-Wired w/Battery Back-up Ionization Smoke Detector $24.99 Was $29.00

Now$2499
current price Now $24.99, Was $29.00$29.00
BRK Hard-Wired w/Battery Back-up Ionization Smoke Detector
1454.7 out of 5 Stars. 145 reviews
First Alert SMICO100-AC Interconnect Hardwire 2-in-1 Smoke and CO Alarm with Battery Backup, Ionization $49.51

$4951
current price $49.51First Alert SMICO100-AC Interconnect Hardwire 2-in-1 Smoke and CO Alarm with Battery Backup, Ionization
1244.2 out of 5 Stars. 124 reviews
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SITERWELL Hardwired Interconnected Smoke Detector, Photoelectric Smoke Alarm with 9V Backup Battery, Fire Alarm with Test/Silence Button, ETL Listed, GS562A, 1 Pack From $26.21

9 options
Available in additional 9 optionsFrom$2621
SITERWELL Hardwired Interconnected Smoke Detector, Photoelectric Smoke Alarm with 9V Backup Battery, Fire Alarm with Test/Silence Button, ETL Listed, GS562A, 1 Pack
1374.4 out of 5 Stars. 137 reviews
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Kidde Hardwired Photoelectric Smoke Detector Alarm, AA Battery Backup, 5-inch From $34.84

2 options
Available in additional 2 optionsFrom$3484
Kidde Hardwired Photoelectric Smoke Detector Alarm, AA Battery Backup, 5-inch
1633.8 out of 5 Stars. 163 reviews
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Kidde 10-Year Sealed Lithium Battery-Operated Photoelectric Smoke Detector Alarm, 5-Inch, 2 Pack From $65.00

2 options
Available in additional 2 optionsFrom$6500
Kidde 10-Year Sealed Lithium Battery-Operated Photoelectric Smoke Detector Alarm, 5-Inch, 2 Pack
1483.6 out of 5 Stars. 148 reviews
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First Alert Voice Alert Hard-Wired Photoelectric Smoke Detector $34.90

$3490
current price $34.90First Alert Voice Alert Hard-Wired Photoelectric Smoke Detector
234.5 out of 5 Stars. 23 reviews
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Knox Safety Plugin Carbon Monoxide Detector, Voice Alert & LCD Display, 10-Year Battery Backup From $51.00

3 options
Available in additional 3 optionsFrom$5100
Knox Safety Plugin Carbon Monoxide Detector, Voice Alert & LCD Display, 10-Year Battery Backup
1904 out of 5 Stars. 190 reviews
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Siterwell AA Battery Operated Carbon Monoxide Detector Alarm, LCD Display,Portable for Travel Home,1-pack From $21.31

3 options
Available in additional 3 optionsFrom$2131
Siterwell AA Battery Operated Carbon Monoxide Detector Alarm, LCD Display,Portable for Travel Home,1-pack
1354.6 out of 5 Stars. 135 reviews
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Fixdono Natural Propane Gas Detector, Home Gas Alarm and Monitor, Leak Alarm for LNG, LPG, Methane in Kitchen, Home, Camper $17.99 Was $31.99

Now$1799
current price Now $17.99, Was $31.99$31.99
Fixdono Natural Propane Gas Detector, Home Gas Alarm and Monitor, Leak Alarm for LNG, LPG, Methane in Kitchen, Home, Camper
1534.5 out of 5 Stars. 153 reviews
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X-Sense Combination Smoke and Carbon Monoxide Alarm, 10-Year Battery Powered Detector, UL Certified, 1 PACK, XP0H-SN From $42.99

2 options
Available in additional 2 optionsFrom$4299
X-Sense Combination Smoke and Carbon Monoxide Alarm, 10-Year Battery Powered Detector, UL Certified, 1 PACK, XP0H-SN
1784.7 out of 5 Stars. 178 reviews
First Alert SMCO200V Battery-Operated 2-in-1 Smoke and CO Alarm with Voice and Location Alerts, 1046795 $36.99

$3699
current price $36.99First Alert SMCO200V Battery-Operated 2-in-1 Smoke and CO Alarm with Voice and Location Alerts, 1046795
264.8 out of 5 Stars. 26 reviews
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SITERWELL Hardwired Smoke & Carbon Monoxide Detector Combo,10 Year Battery,UL217-9th,Interconnected,Bilingual Voice Alerts,6.1in*1.65in.1 pack From $35.14

3 options
Available in additional 3 optionsFrom$3514
SITERWELL Hardwired Smoke & Carbon Monoxide Detector Combo,10 Year Battery,UL217-9th,Interconnected,Bilingual Voice Alerts,6.1in*1.65in.1 pack
64.3 out of 5 Stars. 6 reviews
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Photoelectric Smoke Alarm Detector, Home Fire Safety Sensor Alert, 3V AA Battery Operated, No Wiring Required From $14.99
From$1499
Photoelectric Smoke Alarm Detector, Home Fire Safety Sensor Alert, 3V AA Battery Operated, No Wiring Required
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