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Best Buy customers often prefer the following products when searching for sensor security.

A security sensor is a device that is designed to detect the presence of an intruder and alert the homeowner. They are often used in conjunction with a video surveillance system. Browse the top-ranked list of security sensors below along with associated reviews and opinions.

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  1. SimpliSafe - 4pack Entry Sensor - White - Front_Zoom
    Top comment

    "Sensor Review...Sensors work perfectly. Easy to setup and install....SimpliSafe Sensor...Easy Setup, system recognized new sensors immediately."

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    Product Description

    Easy to install on every type of door or window. The magnet goes on the door or window, and the sensor goes on the frame (or vice versa). Magnet can be placed up to 2 inches from the sensor, so sensors fit on all types of doors and windows. SimpliSafe sensors come with the battery pre-installed and adhesive tape pre-applied, making set-up a snap.
    See all Door & Window Alarms
    Top comment

    "Sensor Review...Sensors work perfectly. Easy to setup and install....SimpliSafe Sensor...Easy Setup, system recognized new sensors immediately."

    See all customer reviews

    Product Description

    Easy to install on every type of door or window. The magnet goes on the door or window, and the sensor goes on the frame (or vice versa). Magnet can be placed up to 2 inches from the sensor, so sensors fit on all types of doors and windows. SimpliSafe sensors come with the battery pre-installed and adhesive tape pre-applied, making set-up a snap.
    See all Door & Window Alarms
    See all Door & Window Alarms
  2. Ring - Alarm Contact Sensor (2nd Gen) (2-Pack) - White - Front_Zoom
    Top comment

    "Replacement sensors....Replaced faulty sensor, new sensor works great. Easy installation....Great Alarm sensors...2nd gen sensor are so sleek, very simple installation."

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    Product Description

    Expand your Ring Alarm system to secure each door and window in your home, and hear chirps as soon as they open. Ring Alarm Contact Sensors mount to any door or window frame in your home for easy, DIY installation. Connect them to your Ring Alarm and receive mobile alerts from the Ring App so you’ll always be the first to know when something’s ajar. Ring Protect subscription required, sold separately.*
    See all Door & Window Alarms
    Top comment

    "Replacement sensors....Replaced faulty sensor, new sensor works great. Easy installation....Great Alarm sensors...2nd gen sensor are so sleek, very simple installation."

    See all customer reviews

    Product Description

    Expand your Ring Alarm system to secure each door and window in your home, and hear chirps as soon as they open. Ring Alarm Contact Sensors mount to any door or window frame in your home for easy, DIY installation. Connect them to your Ring Alarm and receive mobile alerts from the Ring App so you’ll always be the first to know when something’s ajar. Ring Protect subscription required, sold separately.*
    See all Door & Window Alarms
    See all Door & Window Alarms
  3. Ring - Alarm Outdoor Contact Sensor - Gray - Front_Zoom

    Model: B0923BK77S
    SKU: 6481972
    Top comment

    "Outdoor sensor...Great build sensors...This sensor will give you a piece of mind adding sensors to your fence gates even to the shed, this sensors are well build, weather resistant"

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    Product Description

    Help secure outdoor gates, sheds, guesthouses, and windows with Ring Alarm Outdoor Contact Sensor. Get mobile alerts when your outdoor gate opens, or set the sensor to automatically trigger your Ring Alarm siren when armed in Home or Away mode. Outdoor Contact Sensor comes with mounting tape and screws for easy installation on most surfaces.
    See all Door & Window Alarms
    Top comment

    "Outdoor sensor...Great build sensors...This sensor will give you a piece of mind adding sensors to your fence gates even to the shed, this sensors are well build, weather resistant"

    See all customer reviews

    Product Description

    Help secure outdoor gates, sheds, guesthouses, and windows with Ring Alarm Outdoor Contact Sensor. Get mobile alerts when your outdoor gate opens, or set the sensor to automatically trigger your Ring Alarm siren when armed in Home or Away mode. Outdoor Contact Sensor comes with mounting tape and screws for easy installation on most surfaces.
    See all Door & Window Alarms
    See all Door & Window Alarms
  4. Ring - Alarm Contact Sensor (2nd Gen) (6-Pack) - White - Front_Zoom
    Top comment

    "Compact size sensor...I ordered more sensors for additional security of My house...Ring contact sensor...Ring contact sensors made new home security installation a snap."

    See all customer reviews

    Product Description

    Expand your Ring Alarm system to secure each door and window in your home, and hear chirps as soon as they open. Ring Alarm Contact Sensors mount to any door or window frame in your home for easy, DIY installation. Connect them to your Ring Alarm and receive mobile alerts from the Ring App so you’ll always be the first to know when something’s ajar. Ring Protect subscription required, sold separately.*
    See all Door & Window Alarms
    Top comment

    "Compact size sensor...I ordered more sensors for additional security of My house...Ring contact sensor...Ring contact sensors made new home security installation a snap."

    See all customer reviews

    Product Description

    Expand your Ring Alarm system to secure each door and window in your home, and hear chirps as soon as they open. Ring Alarm Contact Sensors mount to any door or window frame in your home for easy, DIY installation. Connect them to your Ring Alarm and receive mobile alerts from the Ring App so you’ll always be the first to know when something’s ajar. Ring Protect subscription required, sold separately.*
    See all Door & Window Alarms
    See all Door & Window Alarms
  5. Ring - Alarm Security Kit 9-Piece (2nd Gen) - White - Front_Zoom
    Top comment

    "Great security system, small monthly fee for app...It hurts if you’re close to the base. Great security system overall....Easy great value security bundle...Love this security bundle and how easy it was to install all the different tools and sensors.Really love it also came with multiple door sensors."

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    Product Description

    Help secure your home against break-ins, and more, with Ring Alarm. When armed, Ring Alarm's siren sounds whenever doors or windows open and when motion is detected at home. Level-up your protection with a Ring Protect Pro subscription, sold separately, to get real-time alerts in the Ring App when your Alarm is triggered*, on-demand emergency support with optional Alarm Professional Monitoring**, and other benefits that keep your security ready for anything.
    See all Home Security Systems
    Top comment

    "Great security system, small monthly fee for app...It hurts if you’re close to the base. Great security system overall....Easy great value security bundle...Love this security bundle and how easy it was to install all the different tools and sensors.Really love it also came with multiple door sensors."

    See all customer reviews

    Product Description

    Help secure your home against break-ins, and more, with Ring Alarm. When armed, Ring Alarm's siren sounds whenever doors or windows open and when motion is detected at home. Level-up your protection with a Ring Protect Pro subscription, sold separately, to get real-time alerts in the Ring App when your Alarm is triggered*, on-demand emergency support with optional Alarm Professional Monitoring**, and other benefits that keep your security ready for anything.
    See all Home Security Systems
    See all Home Security Systems
  6. SimpliSafe - Indoor Home Security System with Smart Alarm Wireless Indoor Camera 8-piece - White - Angle_Zoom
    Top comment

    "I later added a glass break sensor. I should note that Gen 2 / 1 sensors are not compatible with a Gen 3 system. ...The SimpliSafe 8pc Indoor Security Kit is a popular DIY home security system that is known for its ease of use, flexibility, and affordability. "

    See all customer reviews

    Product Description

    SimpliSafe delivers advanced security solutions that put you, your home, and your safety first. With optional professional monitoring powered by Fast Protect Technology, SimpliSafe combines innovative hardware with advanced AI and real people — for 24/7 professional monitoring that delivers fast emergency response when you need it most. The award-winning SimpliSafe system is effective, intuitive, and affordable – so that home can be safe and secure for everyone. You can protect every inch of your home. SimpliSafe has sensors for every room, window and door. HD security cameras for inside and out. Smarter ways to detect motion that alert you only when a threat is real. Hazard sensors that detect floods, and other threats to your home. Powerful sirens that can help stop intruders in their tracks. And, it’s backed by optional 24/7 professional monitoring—experts who are ready to dispatch emergency help immediately. That’s the unmatched combination that separates SimpliSafe Home Security from the others. Our bundles are designed from the start to be effective yet affordable. And with no long-term contracts or hidden fees.This 8-piece bundle provides 24/7 protection. The Smart Alarm Wireless Indoor Security Camera helps stop crime in real time with live guard protection that allows monitoring agents to see, speak to, and deter intruders during an active alarm*. The camera also features a built in privacy shutter that you control. The Base Station is the brains of the system. It sends alarm signals to the monitoring center with a built-in cellular connection and includes a back up battery that lasts up to 24 hours and a loud, 95 dB siren. The smash-safe Keypad is soft to the touch, easy to use during the day and night, and requires no plug so it can be placed anywhere. Entry Sensors (4 total) protect your doors, windows, and cabinets and are designed to blend into the background. And the Motion Sensor is designed for human detection, not pet detection. Advanced security, whole home protection. There's no safe like SimpliSafe.
    See all Home Security Systems
    Top comment

    "I later added a glass break sensor. I should note that Gen 2 / 1 sensors are not compatible with a Gen 3 system. ...The SimpliSafe 8pc Indoor Security Kit is a popular DIY home security system that is known for its ease of use, flexibility, and affordability. "

    See all customer reviews

    Product Description

    SimpliSafe delivers advanced security solutions that put you, your home, and your safety first. With optional professional monitoring powered by Fast Protect Technology, SimpliSafe combines innovative hardware with advanced AI and real people — for 24/7 professional monitoring that delivers fast emergency response when you need it most. The award-winning SimpliSafe system is effective, intuitive, and affordable – so that home can be safe and secure for everyone. You can protect every inch of your home. SimpliSafe has sensors for every room, window and door. HD security cameras for inside and out. Smarter ways to detect motion that alert you only when a threat is real. Hazard sensors that detect floods, and other threats to your home. Powerful sirens that can help stop intruders in their tracks. And, it’s backed by optional 24/7 professional monitoring—experts who are ready to dispatch emergency help immediately. That’s the unmatched combination that separates SimpliSafe Home Security from the others. Our bundles are designed from the start to be effective yet affordable. And with no long-term contracts or hidden fees.This 8-piece bundle provides 24/7 protection. The Smart Alarm Wireless Indoor Security Camera helps stop crime in real time with live guard protection that allows monitoring agents to see, speak to, and deter intruders during an active alarm*. The camera also features a built in privacy shutter that you control. The Base Station is the brains of the system. It sends alarm signals to the monitoring center with a built-in cellular connection and includes a back up battery that lasts up to 24 hours and a loud, 95 dB siren. The smash-safe Keypad is soft to the touch, easy to use during the day and night, and requires no plug so it can be placed anywhere. Entry Sensors (4 total) protect your doors, windows, and cabinets and are designed to blend into the background. And the Motion Sensor is designed for human detection, not pet detection. Advanced security, whole home protection. There's no safe like SimpliSafe.
    See all Home Security Systems
    See all Home Security Systems
  7. SimpliSafe - 2 Camera Outdoor Wireless Security System with 5 Sensors - White - Front_Zoom
    Top comment

    "Easy to use Wireless Home Security System...SimpliSafe home security system is an excellent DIY system. This package comes with the Base station, 4 entry sensors, 1 motion sensor, 2 cameras, a keypad, and all the mounting hardware required. ...Great security system...I love the Simplisafe outdoor Home Security system. This set comes with the base station, keypad, 4 entry sensors, 2 cameras, and motion sensor. "

    See all customer reviews

    Product Description

    SimpliSafe delivers advanced security solutions that put you, your home, and your safety first. With optional professional monitoring powered by Fast Protect Technology, SimpliSafe combines innovative hardware with advanced AI and real people — for 24/7 professional monitoring that delivers fast emergency response when you need it most. The award-winning SimpliSafe system is effective, intuitive, and affordable – so that home can be safe and secure for everyone. You can protect every inch of your home. SimpliSafe has sensors for every room, window and door. HD security cameras for inside and out. Smarter ways to detect motion that alert you only when a threat is real. Hazard sensors that detect floods, and other threats to your home. Powerful sirens that can help stop intruders in their tracks. And, it’s backed by optional 24/7 professional monitoring—experts who are ready to dispatch emergency help immediately. That’s the unmatched combination that separates SimpliSafe Home Security from the others. Our bundles are designed to be effective yet affordable. And with no long-term contracts or hidden fees. This 9-piece wireless security bundle provides 24/7 protection. The Base Station is the brains of the system. It sends alarm signals to the monitoring center with a built-in cellular connection and includes a back up battery that lasts up to 24 hours and a loud, 95 dB siren. The smash-safe Keypad is soft to the touch, easy to use during the day and night, and requires no plug so it can be placed anywhere. The Wireless Outdoor Security cameras (2 total) keep watch with a 140 degree field of view, 1080p HD resolution and color night vision, and include 2-way audio so you can tell unwanted guests that they're being watched. The Entry Sensors (4 total) protect your doors, windows, and cabinets and are designed to blend into the background. And the Motion Sensor is designed for human detection, not pet detection. Advanced security, whole home protection. There's no safe like SimpliSafe.
    See all Home Security Systems
    Top comment

    "Easy to use Wireless Home Security System...SimpliSafe home security system is an excellent DIY system. This package comes with the Base station, 4 entry sensors, 1 motion sensor, 2 cameras, a keypad, and all the mounting hardware required. ...Great security system...I love the Simplisafe outdoor Home Security system. This set comes with the base station, keypad, 4 entry sensors, 2 cameras, and motion sensor. "

    See all customer reviews

    Product Description

    SimpliSafe delivers advanced security solutions that put you, your home, and your safety first. With optional professional monitoring powered by Fast Protect Technology, SimpliSafe combines innovative hardware with advanced AI and real people — for 24/7 professional monitoring that delivers fast emergency response when you need it most. The award-winning SimpliSafe system is effective, intuitive, and affordable – so that home can be safe and secure for everyone. You can protect every inch of your home. SimpliSafe has sensors for every room, window and door. HD security cameras for inside and out. Smarter ways to detect motion that alert you only when a threat is real. Hazard sensors that detect floods, and other threats to your home. Powerful sirens that can help stop intruders in their tracks. And, it’s backed by optional 24/7 professional monitoring—experts who are ready to dispatch emergency help immediately. That’s the unmatched combination that separates SimpliSafe Home Security from the others. Our bundles are designed to be effective yet affordable. And with no long-term contracts or hidden fees. This 9-piece wireless security bundle provides 24/7 protection. The Base Station is the brains of the system. It sends alarm signals to the monitoring center with a built-in cellular connection and includes a back up battery that lasts up to 24 hours and a loud, 95 dB siren. The smash-safe Keypad is soft to the touch, easy to use during the day and night, and requires no plug so it can be placed anywhere. The Wireless Outdoor Security cameras (2 total) keep watch with a 140 degree field of view, 1080p HD resolution and color night vision, and include 2-way audio so you can tell unwanted guests that they're being watched. The Entry Sensors (4 total) protect your doors, windows, and cabinets and are designed to blend into the background. And the Motion Sensor is designed for human detection, not pet detection. Advanced security, whole home protection. There's no safe like SimpliSafe.
    See all Home Security Systems
    See all Home Security Systems
  8. SimpliSafe - Indoor Home Security System (8-piece) - White - Front_Zoom
    Top comment

    "Simplisafe is one of the few full security systems in a market quickly being overrun by a plethora of smart security systems. ...Home security...Motion sensors are very responsive."

    See all customer reviews

    Product Description

    SimpliSafe delivers advanced security solutions that put you, your home, and your safety first. With optional professional monitoring powered by Fast Protect Technology, SimpliSafe combines innovative hardware with advanced AI and real people — for 24/7 professional monitoring that delivers fast emergency response when you need it most. The award-winning SimpliSafe system is effective, intuitive, and affordable – so that home can be safe and secure for everyone. You can protect every inch of your home. SimpliSafe has sensors for every room, window and door. HD security cameras for inside and out. Smarter ways to detect motion that alert you only when a threat is real. Hazard sensors that detect floods, and other threats to your home. Powerful sirens that can help stop intruders in their tracks. And, it’s backed by optional 24/7 professional monitoring—experts who are ready to dispatch emergency help immediately. That’s the unmatched combination that separates SimpliSafe Home Security from the others. At SimpliSafe, we believe everyone deserves to feel safe at home. That's why our bundles are designed to be effective yet affordable. And with no long-term contracts or hidden fees. This 8-piece wireless security bundle provides 24/7 protection. The Base Station is the brains of the system. It sends alarm signals to the monitoring center with a built-in cellular connection and includes a back up battery that lasts up to 24 hours and a loud, 95 dB siren. The smash-safe Keypad is soft to the touch, easy to use during the day and night, and requires no plug so it can be placed anywhere. Entry Sensors (4 total) protect your doors, windows, and cabinets and are designed to blend into the background. And Motion Sensors (2 total) are designed for human detection, not pet detection. Advanced security, whole home protection. There's no safe like SimpliSafe.
    See all Home Security Systems
    Top comment

    "Simplisafe is one of the few full security systems in a market quickly being overrun by a plethora of smart security systems. ...Home security...Motion sensors are very responsive."

    See all customer reviews

    Product Description

    SimpliSafe delivers advanced security solutions that put you, your home, and your safety first. With optional professional monitoring powered by Fast Protect Technology, SimpliSafe combines innovative hardware with advanced AI and real people — for 24/7 professional monitoring that delivers fast emergency response when you need it most. The award-winning SimpliSafe system is effective, intuitive, and affordable – so that home can be safe and secure for everyone. You can protect every inch of your home. SimpliSafe has sensors for every room, window and door. HD security cameras for inside and out. Smarter ways to detect motion that alert you only when a threat is real. Hazard sensors that detect floods, and other threats to your home. Powerful sirens that can help stop intruders in their tracks. And, it’s backed by optional 24/7 professional monitoring—experts who are ready to dispatch emergency help immediately. That’s the unmatched combination that separates SimpliSafe Home Security from the others. At SimpliSafe, we believe everyone deserves to feel safe at home. That's why our bundles are designed to be effective yet affordable. And with no long-term contracts or hidden fees. This 8-piece wireless security bundle provides 24/7 protection. The Base Station is the brains of the system. It sends alarm signals to the monitoring center with a built-in cellular connection and includes a back up battery that lasts up to 24 hours and a loud, 95 dB siren. The smash-safe Keypad is soft to the touch, easy to use during the day and night, and requires no plug so it can be placed anywhere. Entry Sensors (4 total) protect your doors, windows, and cabinets and are designed to blend into the background. And Motion Sensors (2 total) are designed for human detection, not pet detection. Advanced security, whole home protection. There's no safe like SimpliSafe.
    See all Home Security Systems
    See all Home Security Systems
  9. Night Owl - 10 Channel 4 Camera Wire Free 1080p 1TB NVR Security System - White - Front_Zoom
    Top comment

    "Additionally there are motion detection sensors as well as decent infrared night vision. ...Overall i love this Night Owl security set for its clarity, night vision, spot lights, and audio fearures. "

    See all customer reviews

    Product Description

    Night Owl is excited to offer our U.S. designed and engineered 4K HD Wi-Fi Bluetooth Network Video Recorder with Wire Free 1080p Spotlight Cameras and Pre-Installed Hard Drive. This system comes with 1080p wire free cameras, but is 4K ready and can accommodate our 1080p and 4K Wi-Fi devices. With Secure App-Based Bluetooth Setup, there is no need to connect a TV or monitor for setup or viewing (optional). Our patent pending recorder has built-in Bluetooth technology, making it easy for you to configure your system right from the app on your smartphone or tablet. While a TV or monitor is not required, with Google Assistant you can use simple voice commands to stream camera footage directly to your TV or monitor, all while remaining hands free. Each camera has 2-Way Audio (talk & listen) as well as a built-in siren and preset voice alerts. From within the app, you can easily activate the built-in siren, startling intruders and sending them packing. Have a guest but can’t get to them? Use a preset voice alert to let them know! Human Detection Technology with Vehicle Alerts reduces the risk of false alarms, keeping you safe and well protected. Motion-activated dual spotlights flood your yard with bright lights when human motion is detected, instantly warding off trespassers. Need more coverage? Easily add our compatible wire free, Wi-Fi IP and doorbell cameras to your recorder to boost your viewing area. Proudly designed and engineered in the U.S.A., our security system uses a built-in wireless connection for uninterrupted viewing with no delays. Our app gives you control of your system and easy access to your recordings, regardless of where you are. Night Owl never charges fees for storage or access to your videos. All recordings are securely stored on a hard drive for local storage. You can view and download the recordings as you need them. This system provides technology to give you the ultimate security experience.
    See all Security Camera Systems
    Top comment

    "Additionally there are motion detection sensors as well as decent infrared night vision. ...Overall i love this Night Owl security set for its clarity, night vision, spot lights, and audio fearures. "

    See all customer reviews

    Product Description

    Night Owl is excited to offer our U.S. designed and engineered 4K HD Wi-Fi Bluetooth Network Video Recorder with Wire Free 1080p Spotlight Cameras and Pre-Installed Hard Drive. This system comes with 1080p wire free cameras, but is 4K ready and can accommodate our 1080p and 4K Wi-Fi devices. With Secure App-Based Bluetooth Setup, there is no need to connect a TV or monitor for setup or viewing (optional). Our patent pending recorder has built-in Bluetooth technology, making it easy for you to configure your system right from the app on your smartphone or tablet. While a TV or monitor is not required, with Google Assistant you can use simple voice commands to stream camera footage directly to your TV or monitor, all while remaining hands free. Each camera has 2-Way Audio (talk & listen) as well as a built-in siren and preset voice alerts. From within the app, you can easily activate the built-in siren, startling intruders and sending them packing. Have a guest but can’t get to them? Use a preset voice alert to let them know! Human Detection Technology with Vehicle Alerts reduces the risk of false alarms, keeping you safe and well protected. Motion-activated dual spotlights flood your yard with bright lights when human motion is detected, instantly warding off trespassers. Need more coverage? Easily add our compatible wire free, Wi-Fi IP and doorbell cameras to your recorder to boost your viewing area. Proudly designed and engineered in the U.S.A., our security system uses a built-in wireless connection for uninterrupted viewing with no delays. Our app gives you control of your system and easy access to your recordings, regardless of where you are. Night Owl never charges fees for storage or access to your videos. All recordings are securely stored on a hard drive for local storage. You can view and download the recordings as you need them. This system provides technology to give you the ultimate security experience.
    See all Security Camera Systems
    See all Security Camera Systems
  10. Compustar - 1-Way Security System Installation Included - Front_Zoom
    Top comment

    "Great protection for vehicle, shock sensor works great and siren is pretty loud....I replaced the security system on my older Jaguar, and it has worked great for me. "

    See all customer reviews

    Product Description

    300-ft max range alarm bundle with two 1-way remotes. Includes CM2500 control module, shock sensor, siren, LED, and ELOCK starter-kill relay. DroneMobile-ready for telematics/tracking from smartphone.
    See all Car Alarm & Security Systems
    Top comment

    "Great protection for vehicle, shock sensor works great and siren is pretty loud....I replaced the security system on my older Jaguar, and it has worked great for me. "

    See all customer reviews

    Product Description

    300-ft max range alarm bundle with two 1-way remotes. Includes CM2500 control module, shock sensor, siren, LED, and ELOCK starter-kill relay. DroneMobile-ready for telematics/tracking from smartphone.
    See all Car Alarm & Security Systems
    See all Car Alarm & Security Systems
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