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Best Buy customers often prefer the following products when searching for replacement sensors.

A security sensor is a device that monitors an area for the presence of threats or intruders and triggers an alarm or other response when it detects such a presence. They are often used in conjunction with a video surveillance system or other security equipment. Browse the top-ranked list of replacement sensors below along with associated reviews and opinions.

Main Results
  1. Aqara - FP2 Presence Sensor- mmWave Radar Sensor, Zone Positioning, Multi-Person and Fall Detection, Sleep Monitoring - White - Front_Zoom
    Top comment

    "Aqara FP2 Presence Sensor...I received the Aqara - FP2 Presence Sensor in White, it looks stylish and discrete. This sensor is suspended from a double-jointed hinge with a magnetic base at the end, has pre-drilled hole, you can anchor the sensor to a wall or It can be hung upside down at an angle. ...Easy Setup Sensor...The Aqara FP2 Presence Sensor is a standout device in the world of smart home automation. "

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    Product Description

    Aqara Presence Sensor FP2 uses cutting-edge millimeter-wave radar technology, which can accurately detect the presence of people even with slight movements. This technology ensures continuity and stability of the smart device. It also has the function of zone positioning, which allows for the automation of different conditions in different zones, such as beds and tables. One space can now be divided into up to 30 small zones and recognize up to five targets (Multi-person Detection). It can also control other smart home devices through ecosystems such as Apple Home to achieve wider applications. It features functions such as human fall recognition, sleep monitoring and a built-in light sensor. Likewise, it is a great helper that can truly combine the diversity of the user's home life and realize the automation of different personalities.
    See all Motion Sensors & Detectors
    Top comment

    "Aqara FP2 Presence Sensor...I received the Aqara - FP2 Presence Sensor in White, it looks stylish and discrete. This sensor is suspended from a double-jointed hinge with a magnetic base at the end, has pre-drilled hole, you can anchor the sensor to a wall or It can be hung upside down at an angle. ...Easy Setup Sensor...The Aqara FP2 Presence Sensor is a standout device in the world of smart home automation. "

    See all customer reviews

    Product Description

    Aqara Presence Sensor FP2 uses cutting-edge millimeter-wave radar technology, which can accurately detect the presence of people even with slight movements. This technology ensures continuity and stability of the smart device. It also has the function of zone positioning, which allows for the automation of different conditions in different zones, such as beds and tables. One space can now be divided into up to 30 small zones and recognize up to five targets (Multi-person Detection). It can also control other smart home devices through ecosystems such as Apple Home to achieve wider applications. It features functions such as human fall recognition, sleep monitoring and a built-in light sensor. Likewise, it is a great helper that can truly combine the diversity of the user's home life and realize the automation of different personalities.
    See all Motion Sensors & Detectors
    See all Motion Sensors & Detectors
  2. SimpliSafe - Motion Sensor - White - Front_Zoom

    Model: CA001-01RUS
    SKU: 6543525
    Top comment

    "I was always afraid to use a motion sensor due to having a pet, but not anymore. I had always just used glass break sensors. ...I ourchased this sensor becausenit is the updated version. I dont know of its just this sensor, but it has a issue where on ocassion it will go offline, then after a couple hours it will come back online. "

    See all customer reviews

    Product Description

    Detect intruders with SimpliSafe’s high-performance motion sensor. Engineered to tell the difference between people and pets, so if the alarm goes off, you can be confident it’s real. With a 90º field of view and 35 ft. range, it protects an entire room from a single location. Plus, you get fast alerts sent right to your phone when motion is detected so you always know what’s happening at home. And if you have a 24/7 professional monitoring plan—our agents are always ready to send help to your home when an alarm is triggered.
    See all Security Camera & System Accessories
    Top comment

    "I was always afraid to use a motion sensor due to having a pet, but not anymore. I had always just used glass break sensors. ...I ourchased this sensor becausenit is the updated version. I dont know of its just this sensor, but it has a issue where on ocassion it will go offline, then after a couple hours it will come back online. "

    See all customer reviews

    Product Description

    Detect intruders with SimpliSafe’s high-performance motion sensor. Engineered to tell the difference between people and pets, so if the alarm goes off, you can be confident it’s real. With a 90º field of view and 35 ft. range, it protects an entire room from a single location. Plus, you get fast alerts sent right to your phone when motion is detected so you always know what’s happening at home. And if you have a 24/7 professional monitoring plan—our agents are always ready to send help to your home when an alarm is triggered.
    See all Security Camera & System Accessories
    See all Security Camera & System Accessories
  3. Aqara - P2 Door and Window Sensor- Matter Natively Support, Need Matter Border Router, Remote Alarm and Local Automation - White - Front_Zoom
    Top comment

    "Great Matter Door/Window Sensor if you have a Thread border router...Basically, If you have Matter over Thread working in your home, and you need a door/window sensor to give you real time info, this sensor works perfectly and feedback is pretty much instant. ...[Easy Installation & Long Battery Life] With its compact design and adhesive back, the sensor is easily integrated into any interior. Additionally, equipped with a powerful CR123A battery, it provides uninterrupted protection with infrequent replacements.* The battery life may vary depending on the border router and Matter app the sensor is connected to. "

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    Product Description

    Aqara Door and Window Sensor P2 not only incorporates all the advanced automation and security features Aqara is known for, but also gives users the option to connect it directly to third-party Thread border routers, such as smart speakers, and use all the benefits of the Matter smart home standard.
    See all Door & Window Alarms
    Top comment

    "Great Matter Door/Window Sensor if you have a Thread border router...Basically, If you have Matter over Thread working in your home, and you need a door/window sensor to give you real time info, this sensor works perfectly and feedback is pretty much instant. ...[Easy Installation & Long Battery Life] With its compact design and adhesive back, the sensor is easily integrated into any interior. Additionally, equipped with a powerful CR123A battery, it provides uninterrupted protection with infrequent replacements.* The battery life may vary depending on the border router and Matter app the sensor is connected to. "

    See all customer reviews

    Product Description

    Aqara Door and Window Sensor P2 not only incorporates all the advanced automation and security features Aqara is known for, but also gives users the option to connect it directly to third-party Thread border routers, such as smart speakers, and use all the benefits of the Matter smart home standard.
    See all Door & Window Alarms
    See all Door & Window Alarms
  4. Ring - Alarm Contact Sensor (2nd Gen) (1-Pack) - White - Front_Zoom
    Top comment

    "Ring sensor getting the job done...I like the smaller design of the new sensors...Functional replacement for first gen sensors...Old ring contact sensor stopped functioning. Ordered this to replace it. "

    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

    "Ring sensor getting the job done...I like the smaller design of the new sensors...Functional replacement for first gen sensors...Old ring contact sensor stopped functioning. Ordered this to replace it. "

    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. SimpliSafe - Glassbreak Sensor - White - Front_Zoom

    Model: SS3-BBY-GBREAK
    SKU: 6323161
    Top comment

    "Glassbreak Sensors...The Glassbreak Sensors were easy to integrate into the SimpliSafe system and was easy to place in my home....One sensor versus three...This sensor can save you some money when it comes to multiple windows instead of buying individual sensors for each window."

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    Product Description

    Act fast against burglaries with this SimpliSafe glass break sensor. It triggers an alarm if it detects the sound of shattering glass within its 20-foot range, providing reliable security even when no motion detector is used. This SimpliSafe glass break sensor utilizes detection algorithm and digital signal processing technologies for accurate sound recognition.
    See all Door & Window Alarms
    Top comment

    "Glassbreak Sensors...The Glassbreak Sensors were easy to integrate into the SimpliSafe system and was easy to place in my home....One sensor versus three...This sensor can save you some money when it comes to multiple windows instead of buying individual sensors for each window."

    See all customer reviews

    Product Description

    Act fast against burglaries with this SimpliSafe glass break sensor. It triggers an alarm if it detects the sound of shattering glass within its 20-foot range, providing reliable security even when no motion detector is used. This SimpliSafe glass break sensor utilizes detection algorithm and digital signal processing technologies for accurate sound recognition.
    See all Door & Window Alarms
    See all Door & Window Alarms
  6. 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
  7. Ring - Alarm Contact Sensor (2nd Gen) (2-Pack) - White - Front_Zoom
    Top comment

    "Replacement door sensor...The new sensors are much better because of the size. They fit much better and are less noticeable....Replacement sensors....Replaced faulty sensor, new sensor works great. Easy 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
    Top comment

    "Replacement door sensor...The new sensors are much better because of the size. They fit much better and are less noticeable....Replacement sensors....Replaced faulty sensor, new sensor works great. Easy 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
  8. 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...Extra sensor...Needed extra sensors they worked as they should. Great product"

    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...Extra sensor...Needed extra sensors they worked as they should. Great product"

    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
  9. SimpliSafe - 1pack Entry Sensor - White - Front_Zoom

    Model: SS3-ENTRY
    SKU: 6298671
    Top comment

    "great replacements!...We changed some doors and frames during a remodel and the contractor lost the sensors to two doors. These replacements were easy to install and were recognized by the SimpliSafe control center. ...One of my entry sensors broke, and this OEM replacement was perfect."

    See all customer reviews

    Product Description

    Protect all the doors and windows in your home from break-ins with the SimpliSafe entry sensor. Working in tandem with your existing SimpliSafe protection package, this compact and discreet entry sensor goes unnoticed. Installation is a snap: simply place this SimpliSafe entry sensor on any window or door frame, and tap Add Device on your keypad.
    See all Door & Window Alarms
    Top comment

    "great replacements!...We changed some doors and frames during a remodel and the contractor lost the sensors to two doors. These replacements were easy to install and were recognized by the SimpliSafe control center. ...One of my entry sensors broke, and this OEM replacement was perfect."

    See all customer reviews

    Product Description

    Protect all the doors and windows in your home from break-ins with the SimpliSafe entry sensor. Working in tandem with your existing SimpliSafe protection package, this compact and discreet entry sensor goes unnoticed. Installation is a snap: simply place this SimpliSafe entry sensor on any window or door frame, and tap Add Device on your keypad.
    See all Door & Window Alarms
    See all Door & Window Alarms
  10. Google - Nest Temperature Sensor - White - Front_Zoom
    Top comment

    "Solid temperature sensor...Limited time periods of adjusting between sensors....Sensor works...This sensors works! Set up is simpl and easy. Thermostat is downstairs and sensor is upstairs. "

    See all customer reviews

    Product Description

    Control zoned heating and cooling with the efficient setup of this Google Nest temperature sensor. Compatible with the Nest thermostat (not included), this sensor lets you control the temperature and priority for any room in your home. The slim design of this Google Nest temperature sensor is easy to install on a wall or place on a shelf for discreet placement in bedrooms or living spaces.
    See all Water & Temperature Sensors
    Top comment

    "Solid temperature sensor...Limited time periods of adjusting between sensors....Sensor works...This sensors works! Set up is simpl and easy. Thermostat is downstairs and sensor is upstairs. "

    See all customer reviews

    Product Description

    Control zoned heating and cooling with the efficient setup of this Google Nest temperature sensor. Compatible with the Nest thermostat (not included), this sensor lets you control the temperature and priority for any room in your home. The slim design of this Google Nest temperature sensor is easy to install on a wall or place on a shelf for discreet placement in bedrooms or living spaces.
    See all Water & Temperature Sensors
    See all Water & Temperature Sensors
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