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Best Household Sensors Alarms Deals Online In The US


Last Updated - November 3, 2025

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Kidde Carbon Monoxide Detector, Propane, Natural, Methane, & Explosive Gas Alarm, Plug-In Wall with 9-Volt Battery Backup, Digital LED Display
Kidde Carbon Monoxide Detector, Propane, Natural, Methane, & Explosive Gas Alarm, Plug-In Wall with 9-Volt Battery Backup, Digital LED Display
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$55.15$68.97
Best Value
Duracell 21/23 12V Battery, 2 Count (Pack of 1), 21/23 12 Volt Alkaline Batteries, Long-Lasting, Key Fob, Alarm Sensor, Garage Door Openers, and More
Duracell 21/23 12V Battery, 2 Count (Pack of 1), 21/23 12 Volt Alkaline Batteries, Long-Lasting, Key Fob, Alarm Sensor, Garage Door Openers, and More
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$6.25
EPTTECH Smart TLC2326 Tuya Liquid Level Monitor 118 inches APP Oil Water Outdoor Alarm Sensor Household Indicator Ultrasonic Well Monitoring System WiFi Micro Detector Granary Solid Particle Volume
EPTTECH Smart TLC2326 Tuya Liquid Level Monitor 118 inches APP Oil Water Outdoor Alarm Sensor Household Indicator Ultrasonic Well Monitoring System WiFi Micro Detector Granary Solid Particle Volume
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$53.00
Ring Alarm Contact Sensor - 2nd Gen | Instant Window & Door Alerts | Approximately 3-Year Battery Life | Slim Design Fits Any Frame | Easy Installation | Base Station Required
Ring Alarm Contact Sensor - 2nd Gen | Instant Window & Door Alerts | Approximately 3-Year Battery Life | Slim Design Fits Any Frame | Easy Installation | Base Station Required
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$19.99
How to Set Up Home Security - Install Cameras, Alarms, and Prevent Break-ins: A Comprehensive Guide to Protecting Your Home with DIY Security Systems, ... Sensors, and Burglar (The Fixers Handbook)
How to Set Up Home Security - Install Cameras, Alarms, and Prevent Break-ins: A Comprehensive Guide to Protecting Your Home with DIY Security Systems, ... Sensors, and Burglar (The Fixers Handbook)
$5.99
HA-434RTL Home Garage Driveway Business Office Motion Alert and Alarm Security Indoor Outdoor Infrared Detector System Kit
HA-434RTL Home Garage Driveway Business Office Motion Alert and Alarm Security Indoor Outdoor Infrared Detector System Kit
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$27.24
Ring Alarm Contact Sensor 2-Pack - 2nd Gen | Instant Window & Door Alerts | Approximately 3-Year Battery Life | Slim Design | Easy Installation | Base Station Required
Ring Alarm Contact Sensor 2-Pack - 2nd Gen | Instant Window & Door Alerts | Approximately 3-Year Battery Life | Slim Design | Easy Installation | Base Station Required
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$39.99
Rome Tech CR2032 Ring Sensor Battery Replacement Compatible with 2nd Generation Ring Alarm Contact Sensor and 3D Glasses TDG-BR100/BR50 - CR2032 Battery for Ring Sensors for TDG-BR100/BR50
Rome Tech CR2032 Ring Sensor Battery Replacement Compatible with 2nd Generation Ring Alarm Contact Sensor and 3D Glasses TDG-BR100/BR50 - CR2032 Battery for Ring Sensors for TDG-BR100/BR50
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$5.89
8% Off
First Alert Carbon Monoxide Detector, Plug-In Alarm with Battery Backup, CO605, White, 1-Pack
First Alert Carbon Monoxide Detector, Plug-In Alarm with Battery Backup, CO605, White, 1-Pack
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$23.98$25.99
Zuomeng Wireless Salt Level Detector for Water Softener, Real-Time Monitoring, Adjustable Height, Dual Light & 100dB Alarm, Easy Installation, for Salt Tank, and Household Appliances
Zuomeng Wireless Salt Level Detector for Water Softener, Real-Time Monitoring, Adjustable Height, Dual Light & 100dB Alarm, Easy Installation, for Salt Tank, and Household Appliances
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$26.99
Carbon Monoxide Detectors, CO Detector Battery Powered, Carbon Monoxide Alarm with Sensitive CO Sensor, LCD Display and Sound Warning for Home, Bedroom, Kitchen
Carbon Monoxide Detectors, CO Detector Battery Powered, Carbon Monoxide Alarm with Sensitive CO Sensor, LCD Display and Sound Warning for Home, Bedroom, Kitchen
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$9.99
20% Off
Skylink HA-434TL Long Range Household Alert & Alarm Home Garage Driveway Business Office Security Protection Indoor Outdoor Infrared Motion Detector Sensor Accessory
Skylink HA-434TL Long Range Household Alert & Alarm Home Garage Driveway Business Office Security Protection Indoor Outdoor Infrared Motion Detector Sensor Accessory
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$19.99$24.99
15% Off
3 Pack Smoke and Carbon Monoxide detectors Powered by Batteries, with Digital Display, Smoke and Carbon Dioxide Dual Alarm sensors, Easy to Install Black
3 Pack Smoke and Carbon Monoxide detectors Powered by Batteries, with Digital Display, Smoke and Carbon Dioxide Dual Alarm sensors, Easy to Install Black
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$42.16$49.60
Driveway Alarm- 1/2 Mile Long Range Wireless Driveway Alarm Outdoor Weather Resistant Motion Sensor&Detector-DIY Security Alert-Monitor&Protect Outdoor/Indoor Property - 1 Receiver and 2 Sensors
Driveway Alarm- 1/2 Mile Long Range Wireless Driveway Alarm Outdoor Weather Resistant Motion Sensor&Detector-DIY Security Alert-Monitor&Protect Outdoor/Indoor Property - 1 Receiver and 2 Sensors
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$42.99
ViCep 5-Pack CR2025 Battery CR 2025 Batteries 3V Lithium Coin Cell for Car Key Fob, Watches, Remote Control, Alarm Sensor & More, Individual Wrapped
ViCep 5-Pack CR2025 Battery CR 2025 Batteries 3V Lithium Coin Cell for Car Key Fob, Watches, Remote Control, Alarm Sensor & More, Individual Wrapped
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$4.19
Yfwsrecinoe 3 Pack Upgraded Combination Smoke and Carbon Monoxide Alarm Detector, Dual Sensor Smoke Alarm&Carbon Monoxide Detector (Includes Battery)
Yfwsrecinoe 3 Pack Upgraded Combination Smoke and Carbon Monoxide Alarm Detector, Dual Sensor Smoke Alarm&Carbon Monoxide Detector (Includes Battery)
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$46.95
Security Door Window Alarm, Wireless Sensor Door Window Burglar Alarm, Door Alarms for Kids Safety, Easy Installation Doorbell Alarms for Office House Window Pool (4 Pack)
Security Door Window Alarm, Wireless Sensor Door Window Burglar Alarm, Door Alarms for Kids Safety, Easy Installation Doorbell Alarms for Office House Window Pool (4 Pack)
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$9.78
15% Off
SanJie Wireless Door Chime Sensor, When Door Opens, Entry Alarm for Business/Home/Kids, 5 Adjustable Volume Ringer Alert 2 Sensors + 1 Receivers, 500 FT Range,26 Chimes
SanJie Wireless Door Chime Sensor, When Door Opens, Entry Alarm for Business/Home/Kids, 5 Adjustable Volume Ringer Alert 2 Sensors + 1 Receivers, 500 FT Range,26 Chimes
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$23.79$27.99
Wireless Motion Sensor LED Light - Motion Detector Alarm Chimes Door Sensor with 500 FT Range Security Alert Monitor System for Home, Business, Store, Office, School
Wireless Motion Sensor LED Light - Motion Detector Alarm Chimes Door Sensor with 500 FT Range Security Alert Monitor System for Home, Business, Store, Office, School
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$24.99
20% Off
Driveway Alarm Wireless Outside, 1byone Motion Sensor Alarm 1000 FT Range Extra Loud Chimes Home Security Alarm System with 1 Receiver 2 Weatherproof Infrared Sensors Protect Indoor/Outdoor Property
Driveway Alarm Wireless Outside, 1byone Motion Sensor Alarm 1000 FT Range Extra Loud Chimes Home Security Alarm System with 1 Receiver 2 Weatherproof Infrared Sensors Protect Indoor/Outdoor Property
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$27.99$34.99