Surveillance EquipmentAll CamerasAll Home AssistantsAll PhonesAll Security CamerasApple HomeKit Compatible DevicesArloComputer AccessoriesComputer MonitorsDesktop ComputersGeneral Electronic AccessoriesGoogleGoogle HomeGrades 6-12 ElectronicsLaptop AccessoriesLaptopsNetworkingPC GamingPortable AudioRestored AutomotiveRestored HomeRestored PremiumRestored TechRestored ToolsSecurity CamerasSecurity Cameras and Security Camera SystemsShop all Headphones & SpeakersShop by BenefitShop by BrandShop by CompatibilityShop by RoomShop Cameras by TypeSmart Energy and LightingSmart Home Assistants, Controllers & HubsSmart SpeakersSurveillance CamerasWink Compatible DevicesWorks with AlexaWorks with Google Assistant
Sort by|
Surveillance EquipmentAll CamerasAll Home AssistantsAll PhonesAll Security CamerasApple HomeKit Compatible DevicesArloComputer AccessoriesComputer MonitorsDesktop ComputersGeneral Electronic AccessoriesGoogleGoogle HomeGrades 6-12 ElectronicsLaptop AccessoriesLaptopsNetworkingPC GamingPortable AudioRestored AutomotiveRestored HomeRestored PremiumRestored TechRestored ToolsSecurity CamerasSecurity Cameras and Security Camera SystemsShop all Headphones & SpeakersShop by BenefitShop by BrandShop by CompatibilityShop by RoomShop Cameras by TypeSmart Energy and LightingSmart Home Assistants, Controllers & HubsSmart SpeakersSurveillance CamerasWink Compatible DevicesWorks with AlexaWorks with Google Assistant
Detector Sensor(521)
Uses item details. Price when purchased online
(2 pack) Universal Security Instruments, Sensing Plus, Hardwired Smoke & Fire Alarm, Multi-Criteria Detection, with 10 Year Battery Backup $69.88 $34.94/ea
Sponsored
$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
1184.3 out of 5 Stars. 118 reviews
Siterwell AA Battery Operated Carbon Monoxide Detector Alarm, LCD Display,Portable for Travel Home,1-pack From $25.99
Sponsored
From$2599
Siterwell AA Battery Operated Carbon Monoxide Detector Alarm, LCD Display,Portable for Travel Home,1-pack
1314.6 out of 5 Stars. 131 reviews
Best seller eMACROS Motion Sensor Weatherproof Adjustable 1/2 Mile Long Range Solar Wireless Driveway Alarm From $28.04
Sponsored
From$2804
eMACROS Motion Sensor Weatherproof Adjustable 1/2 Mile Long Range Solar Wireless Driveway Alarm
3444.6 out of 5 Stars. 344 reviews
Inkird Home Radon Detector, Portable Radon Meter, Short-Term and Long-Term Accurate Monitoring 2-Year Battery,White From $81.75
Sponsored
From$8175
Inkird Home Radon Detector, Portable Radon Meter, Short-Term and Long-Term Accurate Monitoring 2-Year Battery,White
184.4 out of 5 Stars. 18 reviews
Best seller 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 $15.96 Was $31.99
Now$1596
current price Now $15.96, 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
2734.4 out of 5 Stars. 273 reviews
Deago Water Leak Sensor Detector Flood Alarm Battery Operated Leak Alert Water Detector for Kitchen Bathroom Basement From $10.49
2 options
Available in additional 2 optionsFrom$1049
Deago Water Leak Sensor Detector Flood Alarm Battery Operated Leak Alert Water Detector for Kitchen Bathroom Basement
Best seller GasKnight Natural Gas Detector & Propane Detector. Natural Gas Leak Detection and Monitor for Home, Kitchen, Camper, Trailer or RV. Plug-In Gas Leak Sensor for LPG, LNG, Methane & Butane Gases From $21.99
2 options
Available in additional 2 optionsFrom$2199
GasKnight Natural Gas Detector & Propane Detector. Natural Gas Leak Detection and Monitor for Home, Kitchen, Camper, Trailer or RV. Plug-In Gas Leak Sensor for LPG, LNG, Methane & Butane Gases
564.7 out of 5 Stars. 56 reviews
Teissuly Home Graffiti WiFi Door Magnetic Sensor Intelligent Door And Window Intrusion Detector Alarm
Teissuly Home Graffiti WiFi Door Magnetic Sensor Intelligent Door And Window Intrusion Detector Alarm
6588 WiFi Gas Leak Alarm Household Smart Gas Detector Combustible Gas Leakage Detecting Sensor for Natural Gas Biogas Methane SmartLife APP Remote Control APP Notification Pushing $22.34
$2234
current price $22.346588 WiFi Gas Leak Alarm Household Smart Gas Detector Combustible Gas Leakage Detecting Sensor for Natural Gas Biogas Methane SmartLife APP Remote Control APP Notification Pushing
MesaSe Smart WiFi Infrared Detectors Motion Sensor Alarm $13.97
$1397
current price $13.97MesaSe Smart WiFi Infrared Detectors Motion Sensor Alarm
eMACROS Pro 4 Smart Solar Driveway Alarm (2.4G Wi-Fi Only) - App Push Notifications, 1/2 Mile Wireless Range Motion Sensor & Rechargeable Base Station with 3-Day Backup (No Camera) $56.99
Sponsored
$5699
current price $56.99eMACROS Pro 4 Smart Solar Driveway Alarm (2.4G Wi-Fi Only) - App Push Notifications, 1/2 Mile Wireless Range Motion Sensor & Rechargeable Base Station with 3-Day Backup (No Camera)
25 out of 5 Stars. 2 reviews
SITERWELL Smoke Detector, Magnetic Fastening Kit, Smoke Alarm, Photoelectric ,Low Battery Warning Function, 1 Pack From $17.50
Sponsored
From$1750
SITERWELL Smoke Detector, Magnetic Fastening Kit, Smoke Alarm, Photoelectric ,Low Battery Warning Function, 1 Pack
5284.4 out of 5 Stars. 528 reviews
Wsdcam Window Alarm Sensors 125dB Ultra-Slim Wireless Glass Break Detector Vibration Alarm 8 Pack $49.99
$4999
current price $49.99Wsdcam Window Alarm Sensors 125dB Ultra-Slim Wireless Glass Break Detector Vibration Alarm 8 Pack
154.2 out of 5 Stars. 15 reviews
3X PIR Infrared Motion Sensor Detector, DC 12V-24V Strip Light Motion Sensor Switch, for Cupboard Cabinet Stairs Kitchen $11.86
$1186
current price $11.863X PIR Infrared Motion Sensor Detector, DC 12V-24V Strip Light Motion Sensor Switch, for Cupboard Cabinet Stairs Kitchen
Natural Gas Detector, Digital Sound Warning Gas Detector, LCD/LPG/LNG Natural Gas Leak Security Detection Detector, Alarm Monitor Plug-in Sensor for Home Kitchen Restaurant Hotel School Warehouse $26.89
$2689
current price $26.89Natural Gas Detector, Digital Sound Warning Gas Detector, LCD/LPG/LNG Natural Gas Leak Security Detection Detector, Alarm Monitor Plug-in Sensor for Home Kitchen Restaurant Hotel School Warehouse
24.5 out of 5 Stars. 2 reviews
Best seller Driveway Alarm Wireless, Outdoor Motion Sensor Alarm with Motion Detector, Weatherproof Solar Driveway Alarm, 700 ft Range, 1 Receiver and 1 Sensor, Home Security System, Black $26.99 Was $39.99
Now$2699
current price Now $26.99, Was $39.99$39.99
Driveway Alarm Wireless, Outdoor Motion Sensor Alarm with Motion Detector, Weatherproof Solar Driveway Alarm, 700 ft Range, 1 Receiver and 1 Sensor, Home Security System, Black
1314.3 out of 5 Stars. 131 reviews
Solar Alarm Motion Detector with Sound Outdoor Motion Sensor 129db Barking Dog Strobe Light Gunshot Sound Alarm Detector Noise Maker Warning Lamp for Home Villa Yard Farm From $14.99
2 options
Available in additional 2 optionsFrom$1499
Solar Alarm Motion Detector with Sound Outdoor Motion Sensor 129db Barking Dog Strobe Light Gunshot Sound Alarm Detector Noise Maker Warning Lamp for Home Villa Yard Farm
12 out of 5 Stars. 1 reviews
Clearance Smart WiFi Door & Window Sensor - Wireless Home Security Entry Detector with Real-Time Message Notifications, Ideal for Monitoring Door/Window Open Status in Smart Homes Was $6.99
Smart WiFi Door & Window Sensor - Wireless Home Security Entry Detector with Real-Time Message Notifications, Ideal for Monitoring Door/Window Open Status in Smart Homes
DSC PG9922 Wireless PowerG Glass Break Detector Sensor $144.09
$14409
current price $144.09DSC PG9922 Wireless PowerG Glass Break Detector Sensor
WiFi Smart Motion Sensor Alarm Indoor Infrared PIR Detector Siren Tuya Smart APP Control Wireless Trigger Player Home Security
WiFi Smart Motion Sensor Alarm Indoor Infrared PIR Detector Siren Tuya Smart APP Control Wireless Trigger Player Home Security
24.5 out of 5 Stars. 2 reviews
Sump Pump Alarm, Briidea Indoor/Outdoor High Water Septic Tank Alarm with 110dB Loud Alarm and Large LED Indicator, 10ft Level Float Switch, Ideal for Septic Sump Pump Pond Water Tank $69.99 Was $79.99
Sponsored
Now$6999
current price Now $69.99, Was $79.99$79.99
Sump Pump Alarm, Briidea Indoor/Outdoor High Water Septic Tank Alarm with 110dB Loud Alarm and Large LED Indicator, 10ft Level Float Switch, Ideal for Septic Sump Pump Pond Water Tank
24 out of 5 Stars. 2 reviews
Room Alert 12S Proactive Environment Monitor – Built-in Temperature Sensor, Supports SSL/TLS, SNMP v3, App Alerts, Made in USA $779.00
Sponsored
$77900
current price $779.00Room Alert 12S Proactive Environment Monitor – Built-in Temperature Sensor, Supports SSL/TLS, SNMP v3, App Alerts, Made in USA
Upgraded Smart WiFi Motion Sensor Detector Alarm Indoor with Siren, Phone App, USB Power, Alert Recording, Scheduled Working Times - Infrared Motion Sensor Alarm for Home Garage $22.88
$2288
current price $22.88Upgraded Smart WiFi Motion Sensor Detector Alarm Indoor with Siren, Phone App, USB Power, Alert Recording, Scheduled Working Times - Infrared Motion Sensor Alarm for Home Garage
Alarm Water Leak Sensors Leakage Detectors Home Alert System Overflow $4.99 Was $6.22
Now$499
current price Now $4.99, Was $6.22$6.22
Alarm Water Leak Sensors Leakage Detectors Home Alert System Overflow
SABRE Driveway Alarm, Wireless Motion Detector Sensor System with Driveway Alert, Weatherproof for Outdoor Security $28.55
$2855
current price $28.55SABRE Driveway Alarm, Wireless Motion Detector Sensor System with Driveway Alert, Weatherproof for Outdoor Security
1364.3 out of 5 Stars. 136 reviews
Topvico Water Leak Alarm for Basements, Heater Leak Detector, Sump Pump Overflow Sensor, 120dB Battery-Operated Flood Alarm, 1-Pack From $8.89
5 options
Available in additional 5 optionsFrom$889
Topvico Water Leak Alarm for Basements, Heater Leak Detector, Sump Pump Overflow Sensor, 120dB Battery-Operated Flood Alarm, 1-Pack
404.6 out of 5 Stars. 40 reviews
Deago 1-Pack 120dB Water Leak Leakage Detection Detector Sound Alarm Sensor for Kitchen Bathroom Basement From $8.89
2 options
Available in additional 2 optionsFrom$889
Deago 1-Pack 120dB Water Leak Leakage Detection Detector Sound Alarm Sensor for Kitchen Bathroom Basement
52.8 out of 5 Stars. 5 reviews
Yooshoverk Door Sensor Alarm Magnetic Detector Smart Security for Peace of Mind Wireless for Home Window Protection Safety
Yooshoverk Door Sensor Alarm Magnetic Detector Smart Security for Peace of Mind Wireless for Home Window Protection Safety
Wireless Home Security Driveway Alarm, Motion Sensor Detect Alert, Store Door Entry Chime Doorbell with 1 PIR Motion Sensor Detectors and 1 Wireless Plug-in Receiver for Front Doors Window Frames $14.98
$1498
current price $14.98Wireless Home Security Driveway Alarm, Motion Sensor Detect Alert, Store Door Entry Chime Doorbell with 1 PIR Motion Sensor Detectors and 1 Wireless Plug-in Receiver for Front Doors Window Frames
74.3 out of 5 Stars. 7 reviews
Clearance Rirool Natural Gas Detector with Digital Display, 85dB Alarm, Plug-in Gas Leak Sensor for Home, Kitchen, Restaurant, Hotel, School, Warehouse Safety Monitor $17.66 Was $24.99
Now$1766
current price Now $17.66, Was $24.99$24.99
Rirool Natural Gas Detector with Digital Display, 85dB Alarm, Plug-in Gas Leak Sensor for Home, Kitchen, Restaurant, Hotel, School, Warehouse Safety Monitor
294.8 out of 5 Stars. 29 reviews
eMACROS 500ft Range Security Sensors & Alarms, 2 Count From $11.69
Sponsored
From$1169
eMACROS 500ft Range Security Sensors & Alarms, 2 Count
594 out of 5 Stars. 59 reviews
Best seller 1/2 Mile Long Range Solar Wireless Driveway Alarm System IP65 Weatherproof Outdoor Motion Detectors&Sensor 120dB Siren Sound Light Security Alert System Monitor&Protect Outdoor/Indoor Property(1R2S) From $29.99
Sponsored
From$2999
1/2 Mile Long Range Solar Wireless Driveway Alarm System IP65 Weatherproof Outdoor Motion Detectors&Sensor 120dB Siren Sound Light Security Alert System Monitor&Protect Outdoor/Indoor Property(1R2S)
1084.5 out of 5 Stars. 108 reviews
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 From $42.25
From$4225
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
3-in-1 CO Temperature & Humidity Sensor Detector, Smart Monitoring Alarm for Kitchen, Garage & Indoor Spaces, Real-Time Air Quality Safety Alert Device From $14.86
From$1486
3-in-1 CO Temperature & Humidity Sensor Detector, Smart Monitoring Alarm for Kitchen, Garage & Indoor Spaces, Real-Time Air Quality Safety Alert Device
YoLink LoRa Smart Outdoor Motion Detector Sensor, Driveway Alert, Property Invasion/Tresspassing Detector, 1/4 Mile Open Air Range, Email/SMS/Push Alerts, Alexa, IFTTT, Home Assistant (Hub Required) From $35.59
From$3559
YoLink LoRa Smart Outdoor Motion Detector Sensor, Driveway Alert, Property Invasion/Tresspassing Detector, 1/4 Mile Open Air Range, Email/SMS/Push Alerts, Alexa, IFTTT, Home Assistant (Hub Required)
114.8 out of 5 Stars. 11 reviews
Driveway Alarm Motion Sensor Alarm Weatherproof Motion Detector Home Security Alert System for Outdoor Alarms Detection $16.32
$1632
current price $16.32Driveway Alarm Motion Sensor Alarm Weatherproof Motion Detector Home Security Alert System for Outdoor Alarms Detection
223.4 out of 5 Stars. 22 reviews
2Packs/Set WiFi Door Sensor Detector Smart, Wireless Window Sensor Real-time Alarm Compatible, Home Security Door Open Contact Sensor for Bussiness Burglar Alert From $13.99
2 options
Available in additional 2 optionsFrom$1399
2Packs/Set WiFi Door Sensor Detector Smart, Wireless Window Sensor Real-time Alarm Compatible, Home Security Door Open Contact Sensor for Bussiness Burglar Alert
23 out of 5 Stars. 2 reviews
CPVan 125 dB, 328 ft Range Black Burglar Alarms Household Sensor & Alarm, 1 Piece
CPVan 125 dB, 328 ft Range Black Burglar Alarms Household Sensor & Alarm, 1 Piece
294 out of 5 Stars. 29 reviews
Driveway Alarm Wireless Outside Motion Sensor Alarm with Receiver Weatherproof Infrared Sensor, Indoor Home Security Business Alert System Detector(1Pcs)
Driveway Alarm Wireless Outside Motion Sensor Alarm with Receiver Weatherproof Infrared Sensor, Indoor Home Security Business Alert System Detector(1Pcs)
11 out of 5 Stars. 1 reviews
MOBI Smart Home 2.4GHz WiFi Water Leak Sensor, Water Sensor, Water Detector Alarm; Water Leak & Flood Detector, Smart Notification App, Expand with Cameras & Smart Home Devices. Battery INCLUDED From $13.46
3 options
Available in additional 3 optionsFrom$1346
MOBI Smart Home 2.4GHz WiFi Water Leak Sensor, Water Sensor, Water Detector Alarm; Water Leak & Flood Detector, Smart Notification App, Expand with Cameras & Smart Home Devices. Battery INCLUDED
134.5 out of 5 Stars. 13 reviews
Smart Water Leak Detector, GreenVation WiFi Water Sensor with APP Push and Sound Alarm, 5-Year Battery Life, Suit for Home, Basement, Kitchen, 3 Pack $49.99
$4999
current price $49.99Smart Water Leak Detector, GreenVation WiFi Water Sensor with APP Push and Sound Alarm, 5-Year Battery Life, Suit for Home, Basement, Kitchen, 3 Pack
4 in 1 CO Detector Alarm, Kitchen Garage CO Temperature Humidity Sensor Monitor, Smart Indoor Safety Monitoring Alarm, Safety Monitoring Alarm for Home Kitchen Garage & Indoor Use Was $28.36
4 in 1 CO Detector Alarm, Kitchen Garage CO Temperature Humidity Sensor Monitor, Smart Indoor Safety Monitoring Alarm, Safety Monitoring Alarm for Home Kitchen Garage & Indoor Use
Wifi Natural Gas Sensor Tuya Smart Alarm Gas Leakage Detector Digital LCD Temperature Display for Home Kitchen $15.47
$1547
current price $15.47Wifi Natural Gas Sensor Tuya Smart Alarm Gas Leakage Detector Digital LCD Temperature Display for Home Kitchen
Wsdcam Window Alarm Ultra-Slim Glass Break Sensor 125dB Home Security Alarm System-4 Pack From $25.99
From$2599
Wsdcam Window Alarm Ultra-Slim Glass Break Sensor 125dB Home Security Alarm System-4 Pack
484.3 out of 5 Stars. 48 reviews
Wired Outdoor PIR Motion Sensor Alarm Detector 110 Degree Home Security System Waterproof Grey ABS Burglar Alarm with 8-12m Detection Range $39.65
$3965
current price $39.65Wired Outdoor PIR Motion Sensor Alarm Detector 110 Degree Home Security System Waterproof Grey ABS Burglar Alarm with 8-12m Detection Range
2PCS Smart PIR Sensor Detector Switch 110V 220V Human Body Infrared Motion Sensor Indction Auto on Light Switches $8.31
$831
current price $8.312PCS Smart PIR Sensor Detector Switch 110V 220V Human Body Infrared Motion Sensor Indction Auto on Light Switches
11 out of 5 Stars. 1 reviews
Luxtrada 120dB Water Leak Alarm Detector Sensor Water Leakage Sound Alarm Flood Wired Sensor Siren for Home Security, Basement, Floor, Work Alone Home Security Low Battery Alert $8.82 Was $9.99
Now$882
current price Now $8.82, Was $9.99$9.99
Luxtrada 120dB Water Leak Alarm Detector Sensor Water Leakage Sound Alarm Flood Wired Sensor Siren for Home Security, Basement, Floor, Work Alone Home Security Low Battery Alert
1/2 Mile Long Range Solar Wireless Driveway Alarm System IP65 Weatherproof Outdoor Motion Detectors&Sensor 120dB Siren Sound Light Security Alert System Monitor&Protect Outdoor/Indoor Property From $29.99
8 options
Available in additional 8 optionsFrom$2999
1/2 Mile Long Range Solar Wireless Driveway Alarm System IP65 Weatherproof Outdoor Motion Detectors&Sensor 120dB Siren Sound Light Security Alert System Monitor&Protect Outdoor/Indoor Property
1084.5 out of 5 Stars. 108 reviews
axGear Smart WiFi Door Sensor Window Contacts Open and Close Detector $10.99
$1099
current price $10.99axGear Smart WiFi Door Sensor Window Contacts Open and Close Detector
23 out of 5 Stars. 2 reviews
Tuya Smart WiFi Infrared Detector PIR Motion Sensor Human Body Induction Alarm, Smart Household Appliances
Tuya Smart WiFi Infrared Detector PIR Motion Sensor Human Body Induction Alarm, Smart Household Appliances
Popular in Detector Sensor
Related Products
Glass Break Sensor Detector for Alarm System Wired Glass Break Sensor,1 x Glass Break Sensor Detector,White
Glass Break Sensor Detector for Alarm System Wired Glass Break Sensor,1 x Glass Break Sensor Detector,White
Hosmart Wireless Driveway Alarm 1/2 Mile Range Outdoor Motion Sensor Household Sensors & Alarm
Hosmart Wireless Driveway Alarm 1/2 Mile Range Outdoor Motion Sensor Household Sensors & Alarm$44.99current price $44.99Caregiver Smart Solutions Individual Temperature and Humidity Sensor
Caregiver Smart Solutions Individual Temperature and Humidity Sensor$79.00current price $79.002GIG - Tilt sensor - wireless - 345 MHz - white
2GIG - Tilt sensor - wireless - 345 MHz - white$37.95current price $37.95Bea Active Infrared Sensor for Request 10R2E-100
Bea Active Infrared Sensor for Request 10R2E-100$180.99current price $180.99Hosmart 1/2 Mile Wireless Driveway Household Sensors & Alarms 2 Piece
Hosmart 1/2 Mile Wireless Driveway Household Sensors & Alarms 2 Piece$77.49current price $77.49Yolispa Multifunctional Wireless Driveway Alarm Outside Weatherproof Motion Sensor Alarm 1 Receiver 2 Transmitters with 38 Chimes 200m/656ft Transmission for Indoor Outdoor Use
Yolispa Multifunctional Wireless Driveway Alarm Outside Weatherproof Motion Sensor Alarm 1 Receiver 2 Transmitters with 38 Chimes 200m/656ft Transmission for Indoor Outdoor Use$22.99current price $22.99
