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Best Buy customers often prefer the following products when searching for multi alarms.

Smoke and carbon monoxide (CO) alarms are designed to alert you if there is a fire or CO leak in your home. Because fires can be fast-moving and deadly, smoke alarms should be installed on every level of your home and outside each sleeping area. Here are some excellent smoke and CO alarms on the market today.

Main Results
  1. First Alert - Smoke and Carbon Monoxide Alarm - Works with Ring - White - Front_Zoom
    Top comment

    "It’s actually more than I needed. I wanted a simple smoke/carbon monoxide detector....Great smoke/carbon monoxide combo. Provides great security for your home."

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    Product Description

    First Alert ZCOMBO is a state-of-the-art wireless combination smoke and CO alarm designed to provide early warning of a fire or CO. It features a fully insect screened Photoelectric smoke sensing chamber and an electrochemical carbon monoxide sensor, an 85dB horn, a supervised 3V (2 AA batteries) power supply, utilizes one test button to setup, test and silence. This combination alarm will operate with 3rd party, certified Z-Wave devices enabled with the First Alert protocol and the basic command class required by all Z-Wave devices. First Alert ZCOMBO also includes the Smart Start feature which allows a faster and more intuitive connection of device to hub and on-boarding via use of QR code scan located on device. By the requirements of the Device Class spec, this command class does not have to be mapped to any particular functionality for this device. The alarm supports one association group with up to 1 node and sends its alarms to that group. The alarm supports configuration parameter #1, which has a size of 1, a default value of 0, and when set to 1 causes the device to send double alarm messages. Upon the detection of smoke or CO conditions, the alarm reports smoke and or CO detected to the controller. The device shall send the applicable message when the conditions are cleared. These notifications must be wrapped in the Supervision CC. The following notifications must be supported. The alarm sends a “Heartbeat” signal to hub periodically to confirm operability. It also features tamper resistant locking pins that lock alarm to the mounting bracket and battery drawer to prevent removal of battery or alarm. Designed for wall or ceiling mounting. Includes mounting anchors and screws.
    See all Smoke & Carbon Monoxide Detectors
    Top comment

    "It’s actually more than I needed. I wanted a simple smoke/carbon monoxide detector....Great smoke/carbon monoxide combo. Provides great security for your home."

    See all customer reviews

    Product Description

    First Alert ZCOMBO is a state-of-the-art wireless combination smoke and CO alarm designed to provide early warning of a fire or CO. It features a fully insect screened Photoelectric smoke sensing chamber and an electrochemical carbon monoxide sensor, an 85dB horn, a supervised 3V (2 AA batteries) power supply, utilizes one test button to setup, test and silence. This combination alarm will operate with 3rd party, certified Z-Wave devices enabled with the First Alert protocol and the basic command class required by all Z-Wave devices. First Alert ZCOMBO also includes the Smart Start feature which allows a faster and more intuitive connection of device to hub and on-boarding via use of QR code scan located on device. By the requirements of the Device Class spec, this command class does not have to be mapped to any particular functionality for this device. The alarm supports one association group with up to 1 node and sends its alarms to that group. The alarm supports configuration parameter #1, which has a size of 1, a default value of 0, and when set to 1 causes the device to send double alarm messages. Upon the detection of smoke or CO conditions, the alarm reports smoke and or CO detected to the controller. The device shall send the applicable message when the conditions are cleared. These notifications must be wrapped in the Supervision CC. The following notifications must be supported. The alarm sends a “Heartbeat” signal to hub periodically to confirm operability. It also features tamper resistant locking pins that lock alarm to the mounting bracket and battery drawer to prevent removal of battery or alarm. Designed for wall or ceiling mounting. Includes mounting anchors and screws.
    See all Smoke & Carbon Monoxide Detectors
    See all Smoke & Carbon Monoxide Detectors
  2. Google - Nest Protect 2nd Generation (Battery) Smart Smoke/Carbon Monoxide Alarm - White - Angle_Zoom
    Top comment

    "Great smart smoke/carbon monoxide alarm...I purchased this Nest smoke/carbon monoxide alarm to replace the existing battery operated unsmart smoke/carbon monoxide alarm. ...Great Smoke/Carbon Monoxide alarm...This is my second Nest Smoke/Carbon Monoxide alarm ,this one is in my kitchen.These are really great."

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    Product Description

    Nest Protect Smoke and Carbon Monoxide Alarm - 2nd Generation (Battery): Nest Protect reliably detects and alerts you to the presence of smoke or carbon monoxide in your home. The alarm speaks to you in a calm, clear, human voice, telling you the location of the danger. It also provides smartphone alerts and battery status updates to help protect your home.
    See all Smoke & Carbon Monoxide Detectors
    Top comment

    "Great smart smoke/carbon monoxide alarm...I purchased this Nest smoke/carbon monoxide alarm to replace the existing battery operated unsmart smoke/carbon monoxide alarm. ...Great Smoke/Carbon Monoxide alarm...This is my second Nest Smoke/Carbon Monoxide alarm ,this one is in my kitchen.These are really great."

    See all customer reviews

    Product Description

    Nest Protect Smoke and Carbon Monoxide Alarm - 2nd Generation (Battery): Nest Protect reliably detects and alerts you to the presence of smoke or carbon monoxide in your home. The alarm speaks to you in a calm, clear, human voice, telling you the location of the danger. It also provides smartphone alerts and battery status updates to help protect your home.
    See all Smoke & Carbon Monoxide Detectors
    See all Smoke & Carbon Monoxide Detectors
  3. Google - Nest Protect 2nd Generation Smart Smoke/Carbon Monoxide Wired Alarm - White - Angle_Zoom
    Top comment

    "great smoke/carbon dioxide detector...We really like this smoke/carbon dioxide detector. We like all the Nest products. ...Great smoke & carbon monoxide...Love my new Nest smoke & carbon monoxide detector. Love that I have access through my iphone."

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    Product Description

    Nest Protect reliably detects and alerts you to the presence of smoke or carbon monoxide in your home. The alarm speaks to you in a calm, clear, human voice, telling you the location of the danger. It also provides smartphone alerts and battery status updates to help protect your home. This hardwired version is suitable for homes with existing hardwired smoke or CO detectors.
    See all Smoke & Carbon Monoxide Detectors
    Top comment

    "great smoke/carbon dioxide detector...We really like this smoke/carbon dioxide detector. We like all the Nest products. ...Great smoke & carbon monoxide...Love my new Nest smoke & carbon monoxide detector. Love that I have access through my iphone."

    See all customer reviews

    Product Description

    Nest Protect reliably detects and alerts you to the presence of smoke or carbon monoxide in your home. The alarm speaks to you in a calm, clear, human voice, telling you the location of the danger. It also provides smartphone alerts and battery status updates to help protect your home. This hardwired version is suitable for homes with existing hardwired smoke or CO detectors.
    See all Smoke & Carbon Monoxide Detectors
    See all Smoke & Carbon Monoxide Detectors
  4. Swann - ActiveResponse Personal Safety Alarm Keychain with 110dB Emergency Siren - Black - Front_Zoom
    Top comment

    "Low noise Personal alarm...The instructions have you scan the QR code on the bottom of the alarm to synchronize it to the phone. Once the alarm is synchronized to the phone you can complete the testing of the device. ...More than just a personal alarm...The personal alarms are really easy to link to your phone and set up. "

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    Product Description

    Swann's ActiveResponse Smart Mobile Personal Safety Alarm is stylish yet discreet but has the power to potentially save your life. When you find yourself in the presence of danger or become lost, pull the pin for a loud 110 decibel siren, and / or push the button to alert your primary emergency contact of your location for FREE. A perfect personal security alarm for women. Pair the Mobile Personal Safety Alarm with the Swann Security app on your phone via Bluetooth, to ensure your family, friends, and even emergency services (via subscription), can be alerted to your location. Use the included keyring to clip the Alarm to your keys, bag, backpack, school bag, or use the lanyard to wear it around your neck. Stylish and discreet, it is small enough to carry in a handbag or in your hand. A useful accessory. Use as safety device while running or hiking. With a sturdy, compact design and long battery life, they are the perfect companion for a walk, run, hike or trek. Take one with you when you travel, as they are even allowed on planes where pepper spray and tasers aren’t. A perfect personal safety Alarm for women's self defense. ActiveResponse is also a great gift idea for family, students, seniors, the disabled, shift workers, outdoor enthusiasts and more.
    See all Home Alarms & Sensors
    Top comment

    "Low noise Personal alarm...The instructions have you scan the QR code on the bottom of the alarm to synchronize it to the phone. Once the alarm is synchronized to the phone you can complete the testing of the device. ...More than just a personal alarm...The personal alarms are really easy to link to your phone and set up. "

    See all customer reviews

    Product Description

    Swann's ActiveResponse Smart Mobile Personal Safety Alarm is stylish yet discreet but has the power to potentially save your life. When you find yourself in the presence of danger or become lost, pull the pin for a loud 110 decibel siren, and / or push the button to alert your primary emergency contact of your location for FREE. A perfect personal security alarm for women. Pair the Mobile Personal Safety Alarm with the Swann Security app on your phone via Bluetooth, to ensure your family, friends, and even emergency services (via subscription), can be alerted to your location. Use the included keyring to clip the Alarm to your keys, bag, backpack, school bag, or use the lanyard to wear it around your neck. Stylish and discreet, it is small enough to carry in a handbag or in your hand. A useful accessory. Use as safety device while running or hiking. With a sturdy, compact design and long battery life, they are the perfect companion for a walk, run, hike or trek. Take one with you when you travel, as they are even allowed on planes where pepper spray and tasers aren’t. A perfect personal safety Alarm for women's self defense. ActiveResponse is also a great gift idea for family, students, seniors, the disabled, shift workers, outdoor enthusiasts and more.
    See all Home Alarms & Sensors
    See all Home Alarms & Sensors
  5. Swann - ActiveResponse Personal Safety Alarm Keychain with 110dB Emergency Siren - Aqua - Front_Zoom
    Top comment

    "Great personal alarms!...There is an app to setup and monitor the alarms. You can choose to notify someone when the alarm is triggered. ...Alarm is connected to an app and is a subscription as well. "

    See all customer reviews

    Product Description

    Swann's ActiveResponse Smart Mobile Personal Safety Alarm is stylish yet discreet but has the power to potentially save your life. When you find yourself in the presence of danger or become lost, pull the pin for a loud 110 decibel siren, and / or push the button to alert your primary emergency contact of your location for FREE. A perfect personal security alarm for women. Pair the Mobile Personal Safety Alarm with the Swann Security app on your phone via Bluetooth, to ensure your family, friends, and even emergency services (via subscription), can be alerted to your location. Use the included keyring to clip the Alarm to your keys, bag, backpack, school bag, or use the lanyard to wear it around your neck. Stylish and discreet, it is small enough to carry in a handbag or in your hand. A useful accessory. Use as safety device while running or hiking. With a sturdy, compact design and long battery life, they are the perfect companion for a walk, run, hike or trek. Take one with you when you travel, as they are even allowed on planes where pepper spray and tasers aren’t. A perfect personal safety Alarm for women's self defense. ActiveResponse is also a great gift idea for family, students, seniors, the disabled, shift workers, outdoor enthusiasts and more.
    See all Home Alarms & Sensors
    Top comment

    "Great personal alarms!...There is an app to setup and monitor the alarms. You can choose to notify someone when the alarm is triggered. ...Alarm is connected to an app and is a subscription as well. "

    See all customer reviews

    Product Description

    Swann's ActiveResponse Smart Mobile Personal Safety Alarm is stylish yet discreet but has the power to potentially save your life. When you find yourself in the presence of danger or become lost, pull the pin for a loud 110 decibel siren, and / or push the button to alert your primary emergency contact of your location for FREE. A perfect personal security alarm for women. Pair the Mobile Personal Safety Alarm with the Swann Security app on your phone via Bluetooth, to ensure your family, friends, and even emergency services (via subscription), can be alerted to your location. Use the included keyring to clip the Alarm to your keys, bag, backpack, school bag, or use the lanyard to wear it around your neck. Stylish and discreet, it is small enough to carry in a handbag or in your hand. A useful accessory. Use as safety device while running or hiking. With a sturdy, compact design and long battery life, they are the perfect companion for a walk, run, hike or trek. Take one with you when you travel, as they are even allowed on planes where pepper spray and tasers aren’t. A perfect personal safety Alarm for women's self defense. ActiveResponse is also a great gift idea for family, students, seniors, the disabled, shift workers, outdoor enthusiasts and more.
    See all Home Alarms & Sensors
    See all Home Alarms & Sensors
  6. False Alarm [LP] - VINYL - Front_Zoom
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  7. Sound the Alarm [LP] - VINYL - Front_Zoom
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  8. Homedics - 5-in-1 Hepa Air Purifier with UV-C Technology for Small Rooms - Black - Front_Zoom
    Top comment

    "After spending 30 years married to a smoker I can not express how refreshing it is to be able to have clean pure air in my bedroom once again , which is the designated room were my husband is allowed to smoke . This machine immediately takes his smelly smoke out like magic allowing me the best night sleep I have had in 30 years ! ...Bought this after the fires in Monrovia Ca. The smoke smell was bad. The purifier did not do as good of a job as I thought it should."

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    Product Description

    The Homedics 5-in-1 Hepa Air Purifier with UV-C technology is ideal for creating cleaner air within any small room in your home. The stylish air purifier uses HEPA technology to help remove allergens and contaminants in the air with a UV-C light.
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    Top comment

    "After spending 30 years married to a smoker I can not express how refreshing it is to be able to have clean pure air in my bedroom once again , which is the designated room were my husband is allowed to smoke . This machine immediately takes his smelly smoke out like magic allowing me the best night sleep I have had in 30 years ! ...Bought this after the fires in Monrovia Ca. The smoke smell was bad. The purifier did not do as good of a job as I thought it should."

    See all customer reviews

    Product Description

    The Homedics 5-in-1 Hepa Air Purifier with UV-C technology is ideal for creating cleaner air within any small room in your home. The stylish air purifier uses HEPA technology to help remove allergens and contaminants in the air with a UV-C light.
    See all Air Purifiers
    See all Air Purifiers
  9. Alen - BreatheSmart 75i 1300 SqFt Air Purifier with Pure HEPA Filter for Allergens, Dust & Mold - Oak - Front_Zoom
    Top comment

    "I have peace of mind now that I can close my windows and clean inside air when wildfire smoke is in the forecast, like today 🔥...I live in a condo and have a neighbor who smokes. Their smoke permeates the hallway and gets into all of the units on our floor. "

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    Product Description

    The Alen BreatheSmart 75i is Alen's most powerful unit, capturing the largest numbers of particles in your air in the shortest amount of time. The 75i is ideal for living rooms, open concept spaces, and other large rooms up to 1,300 sq. ft. Alen air purifiers offer superior performance through the combination of a powerful fan, quiet motor, and advanced filtration technology to deliver and maximize airflow while minimizing noise. Our medical-grade filters capture particles as small as 0.1 micron, removing even the tiniest pollutants including dust, pollen, pet dander, mold spores, germs and bacteria, and more. Laser sensor technology detects when particles are present and auto-adjusts fan speed, so you don’t have to. The 5 color coded rings show your indoor air quality at a glance and let you see how Alen is working to clean the air quickly and efficiently. Get real time air quality insights, view historical trends, or control your purifier remotely using the Alen Air app. Alen purifiers are backed by the industry’s only Forever Guarantee.
    See all Air Purifiers
    Top comment

    "I have peace of mind now that I can close my windows and clean inside air when wildfire smoke is in the forecast, like today 🔥...I live in a condo and have a neighbor who smokes. Their smoke permeates the hallway and gets into all of the units on our floor. "

    See all customer reviews

    Product Description

    The Alen BreatheSmart 75i is Alen's most powerful unit, capturing the largest numbers of particles in your air in the shortest amount of time. The 75i is ideal for living rooms, open concept spaces, and other large rooms up to 1,300 sq. ft. Alen air purifiers offer superior performance through the combination of a powerful fan, quiet motor, and advanced filtration technology to deliver and maximize airflow while minimizing noise. Our medical-grade filters capture particles as small as 0.1 micron, removing even the tiniest pollutants including dust, pollen, pet dander, mold spores, germs and bacteria, and more. Laser sensor technology detects when particles are present and auto-adjusts fan speed, so you don’t have to. The 5 color coded rings show your indoor air quality at a glance and let you see how Alen is working to clean the air quickly and efficiently. Get real time air quality insights, view historical trends, or control your purifier remotely using the Alen Air app. Alen purifiers are backed by the industry’s only Forever Guarantee.
    See all Air Purifiers
    See all Air Purifiers
  10. SimpliSafe - Smoke Detector - White - Front_Zoom

    Model: SSSD3
    SKU: 6520590
    Top comment

    "Smoke detector...The smoke detector works great. Tested to see the effect of having this device....The only two downfalls I see to this smoke detector is: 1: There should be a way to say "I'm just cooking" to stop the alarm, and 2: It would be great if it also acted as a carbon monoxide detector as well."

    See all customer reviews

    Product Description

    Protect your home and family from fires with the SimpliSafe Smoke Detector that's fully connected to your SimpliSafe Home Security System. You’ll get an instant alert sent to your phone when dangerous levels of smoke are detected. Plus, with a 24/7 Professional Monitoring Plan, the smoke detector alerts our monitoring center in an emergency. That means you’ll get a fast response from firefighters.
    See all Home Security Accessories
    Top comment

    "Smoke detector...The smoke detector works great. Tested to see the effect of having this device....The only two downfalls I see to this smoke detector is: 1: There should be a way to say "I'm just cooking" to stop the alarm, and 2: It would be great if it also acted as a carbon monoxide detector as well."

    See all customer reviews

    Product Description

    Protect your home and family from fires with the SimpliSafe Smoke Detector that's fully connected to your SimpliSafe Home Security System. You’ll get an instant alert sent to your phone when dangerous levels of smoke are detected. Plus, with a 24/7 Professional Monitoring Plan, the smoke detector alerts our monitoring center in an emergency. That means you’ll get a fast response from firefighters.
    See all Home Security Accessories
    See all Home Security Accessories
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