Best Smoke Detectors With Phone Alerts in the USA

Smoke detectors with phone alerts add an important layer of protection beyond a traditional alarm. Instead of relying only on the siren inside your home, a connected smoke detector can send an alert to your smartphone when smoke or carbon monoxide is detected—even when you are away.

For 2026, the category has changed significantly. Google’s Nest Protect is no longer the primary new-product choice, with First Alert’s SC5 Smart Smoke & Carbon Monoxide Alarm positioned as its replacement and designed to work with existing Nest Protect devices through Google Home.

Our top choice is the First Alert SC5 because it combines smoke and CO detection, phone alerts, voice warnings, smart interconnection, and both battery and hardwired versions.

Best Smoke Detectors With Phone Alerts: Quick Picks

Model	Best For	Smoke	CO	Phone Alerts	Power
First Alert SC5	Best overall	Yes	Yes	Yes	Battery / Hardwired
Kidde 20SAR-W	Best smoke-only smart alarm	Yes	No	Yes	Hardwired
Kidde P4010ACSAQ-WF	Best air-quality smart alarm	Yes	No	Yes	Hardwired
First Alert Z-Wave Plus SMCO410	Best Ring/Z-Wave option	Yes	Yes	Yes*	Battery
First Alert Onelink Safe & Sound	Best speaker-equipped option	Yes	Yes	Yes	Hardwired
Kidde RemoteLync Monitor	Best for existing alarms	Existing alarm	Existing alarm	Yes	Plug-in

*Phone-alert functionality depends on the compatible Z-Wave/Ring setup and hub.

1. First Alert SC5 — Best Smoke Detector With Phone Alerts

Best for: Most homeowners who want smoke and CO detection with smartphone notifications.

The First Alert SC5 is our top choice because it is purpose-built as a connected smoke and carbon monoxide alarm. The First Alert app can send mobile alerts when smoke or CO is detected, allowing you to know about an emergency even when you are away from home.

The SC5 is available in both battery and hardwired versions. The battery model supports wireless interconnection, while the hardwired version provides hardwired interconnection and battery backup. 2

Why the First Alert SC5 is our top pick

• Smoke and carbon monoxide detection in one device.
• Mobile alerts through the First Alert app.
• Alerts work whether you are home or away.
• Voice alerts identify the type and location of danger.
• Heads-Up warnings can provide an early warning before the full alarm.
• Can interconnect with compatible alarms.
• Available in battery and hardwired versions.
• Works with Google Home.
• Designed as a replacement for Nest Protect.

First Alert says the SC5 can also integrate with existing Nest Protect alarms through Google Home, making it particularly useful for homeowners who already have a Nest Protect system. 3

2. Kidde 20SAR-W — Best Smoke-Only Smart Detector

Best for: Homeowners who already have a hardwired smoke-alarm system and want to add smartphone notifications.

The Kidde 20SAR-W is a smart, hardwired smoke alarm that sends mobile alerts through the Kidde app. Importantly, Kidde says that adding one smart alarm can provide mobile alerts for every compatible hardwired alarm in the home. 4

Key features

• Hardwired smoke detector.
• Mobile alerts when smoke is detected.
• Low-battery notifications.
• Whole-home smart connectivity with compatible alarms.
• Enhanced smoke sensing.
• AA battery backup.
• No separate smart hub required.

This is particularly attractive for homeowners who already have compatible Kidde hardwired alarms and do not necessarily need a combination smoke-and-CO detector.

3. Kidde P4010ACSAQ-WF — Best Smart Smoke Detector With Air-Quality Monitoring

Best for: Homeowners who want smoke detection plus additional indoor-air information.

The Kidde P4010ACSAQ-WF combines smoke detection with an indoor-air-quality monitor and Wi-Fi connectivity. Kidde states that the device connects to the Kidde app and can provide status updates and alerts on your phone. 5

It can also work with existing Kidde hardwired interconnected alarms so that when an alarm sounds, compatible alarms activate and an alert is sent to your phone. 6

4. First Alert Z-Wave Plus Smoke & CO Alarm — Best for Ring and Z-Wave Homes

Best for: Homeowners already using a compatible Z-Wave smart-home or Ring ecosystem.

The First Alert Z-Wave Plus smoke and CO alarm is designed to connect to compatible Z-Wave systems. Consumer Reports includes the First Alert Z-Wave FSMCO410BX among its tested combination smoke-and-CO detectors, giving it an overall score of 89. 7

This type of detector is different from a standalone Wi-Fi alarm. The phone notification normally depends on the compatible Z-Wave hub or smart-home system.

Best for

• Ring users.
• Z-Wave smart homes.
• Existing home-automation systems.
• Users who want smoke and CO detection integrated with other smart devices.

5. First Alert Onelink Safe & Sound — Best Smart Smoke Detector With Speaker

Best for: Homeowners who want a hardwired smoke/CO alarm combined with a smart speaker.

The Onelink Safe & Sound combines smoke and carbon monoxide detection with a premium speaker and Amazon Alexa functionality. The Onelink Home app supports the device and provides safety notifications for smoke or CO emergencies. 8

This is more of a multifunction smart-home product than a basic smoke detector, so it makes the most sense when the additional speaker and voice-assistant functionality is useful to you.

6. Kidde RemoteLync Monitor — Best Way to Add Phone Alerts to Existing Alarms

Best for: Homeowners who don’t want to replace all their existing smoke detectors.

A monitor such as the Kidde RemoteLync takes a different approach. Instead of replacing every existing alarm with a smart detector, the monitor can listen for an existing alarm and communicate an alert through its connected system.

This can be particularly useful in an existing home where replacing a large number of conventional alarms would be expensive or inconvenient.

How Smoke Detectors Send Alerts to Your Phone

A smart smoke detector normally contains a wireless communication system in addition to the smoke sensor.

The basic process looks like this:

1. The smoke sensor detects smoke.
2. The detector activates its local alarm.
3. The detector communicates with the manufacturer’s app or smart-home system.
4. The cloud or smart-home platform sends a notification to your smartphone.
5. You receive an alert even if you are away from home.

Consumer Reports describes smartphone alerts as a feature of smart smoke and CO detectors, allowing an app to alert you when detectors go off even when you are not home. 9

Wi-Fi vs. Z-Wave Smoke Detectors

Feature	Wi-Fi	Z-Wave
Phone alerts	Yes	Yes with compatible hub/system
Separate hub required	Usually no	Usually yes
Works with smart-home systems	Yes	Yes
Setup	Usually simpler	More involved
Best for	Most homeowners	Existing Z-Wave/Ring users

Do Smoke Detectors With Phone Alerts Need Wi-Fi?

Not all of them.

Wi-Fi smoke detectors use your home’s Wi-Fi connection to communicate with the manufacturer’s app. Z-Wave models communicate with a compatible hub instead.

For most homeowners starting from scratch, a Wi-Fi model is generally easier because it does not require purchasing a separate Z-Wave hub.

Will a Smart Smoke Detector Alert My Phone Without Internet?

Usually, no.

The local smoke alarm can continue sounding without an internet connection, but a cloud-based phone notification normally requires the detector to communicate with the manufacturer’s online service.

This is an important distinction:

Situation	Local Alarm	Phone Alert
Wi-Fi working + internet working	Yes	Yes
Wi-Fi down	Yes	Usually no
Internet outage	Yes	Usually no
Power outage with battery backup	Yes	Depends on network/router backup

This is why a smart detector should never be considered dependent on its smartphone notification. The local audible alarm remains the primary warning.

Do Smart Smoke Detectors Work During a Power Outage?

It depends on the model.

Battery-powered smart detectors can continue operating from their batteries. Hardwired models generally use a backup battery for the alarm itself.

However, phone notifications are a separate issue. If your Wi-Fi router loses power, the detector may still sound locally while being unable to send a cloud notification.

For important smart-home systems, a UPS for the internet modem/router can help maintain connectivity during short power interruptions, but it should not be treated as a substitute for the detector’s own backup power.

Smoke-Only vs. Smoke + CO Smart Detectors

Feature	Smoke Only	Smoke + CO
Fire detection	Yes	Yes
CO detection	No	Yes
Phone alerts	Available on some models	Available on some models
Number of devices	May require separate CO alarm	Two functions in one device
Best for	Homes with separate CO protection	Most homeowners wanting combined protection

If you are buying new detectors, a certified combination smoke-and-CO model can be convenient because one device provides both types of protection.

Why Phone Alerts Are Useful

The biggest advantage is that smoke alarms normally depend on someone being close enough to hear them.

Phone notifications add another layer of awareness when:

• You are at work.
• You are traveling.
• You are shopping.
• You are asleep in another part of the home.
• Your children or pets are home without you.
• You have a second property.
• You want to know when a detector has a low battery.

First Alert’s SC5, for example, sends mobile alerts when smoke or CO is detected and can provide notifications whether you are home or away. 10

Phone Alerts vs. Professional Alarm Monitoring

Feature	Smart Smoke Detector	Professional Monitoring
Local siren	Yes	Yes
Phone notification	Yes	Usually
24/7 monitoring center	No	Yes
Monthly fee	Usually no	Usually yes
Calls emergency services automatically	Usually no	May be available
Best for	Self-monitoring	Professional response

A smartphone notification is not the same thing as professional monitoring. If an alarm sends you a notification while you are asleep or unavailable, someone still needs to respond appropriately.

Do Smart Smoke Detectors Have Monthly Fees?

Many smart smoke detectors provide basic phone alerts without a monthly monitoring subscription.

The First Alert SC5, for example, provides mobile alerts through its app. 11

However, always check the current manufacturer’s terms because app features and subscription policies can change.

Best Battery Smoke Detector With Phone Alerts

First Alert SC5 Battery is our leading choice.

It combines smoke and CO detection with Wi-Fi connectivity, mobile alerts, voice warnings, wireless interconnection, and a battery-powered installation. First Alert specifies six CR123A lithium batteries and wireless interconnectivity for the battery model. 12

This makes it particularly attractive for:

• Renters.
• Apartments.
• Existing homes without smoke-alarm wiring.
• DIY installations.
• Homes where running electrical wiring is difficult.

Best Hardwired Smoke Detector With Phone Alerts

First Alert SC5 Hardwire is the strongest choice for homeowners who already have hardwired alarms.

It provides Wi-Fi connectivity, mobile notifications, hardwired interconnection, battery backup, voice alerts, and a quick-connect installation system. 13

First Alert lists the hardwired model as compatible with select First Alert/BRK alarms and Google Nest Protect. 14

Best Smart Smoke Detector for an Existing Hardwired System

If your home already contains compatible Kidde hardwired alarms, the Kidde 20SAR-W can be an attractive solution because Kidde says one smart alarm can provide mobile alerts for compatible hardwired alarms throughout the home. 15

This can be considerably easier than replacing every detector with a smart model.

Best Smart Smoke Detector for a Rental

A battery-powered smart detector is generally the most convenient option for a rental because it does not require new electrical wiring.

The First Alert SC5 Battery is particularly interesting because it combines battery operation, wireless interconnection, Wi-Fi connectivity, and phone alerts. 16

However, renters should check landlord and local requirements before replacing or modifying installed life-safety equipment.

Best Smart Smoke Detector for Google Home

The First Alert SC5 is the obvious current choice for homeowners who want Google Home integration.

Google’s store specifically lists the SC5 as compatible with Google Nest Protect and says it can be managed through the Google Home app. 17

This is especially useful for households transitioning away from older Nest Protect units.

What Happened to Google Nest Protect?

Nest Protect remains relevant because many homes still use it, but it should not automatically be treated as the best new purchase in 2026.

First Alert now positions its SC5 as a replacement for Nest Protect. First Alert says the SC5 works alongside existing Nest Protect devices through Google Home and can replace expiring second-generation Nest Protect alarms. 18

If you already own Nest Protects, the SC5 therefore deserves special consideration.

Do Phone Alerts Work When You Are Away From Home?

Yes, that is one of the main reasons to buy a smart smoke detector.

When the detector has a functioning connection to its cloud service, a compatible app can send an alert to your phone even when you are away.

First Alert explicitly describes the SC5 as providing mobile alerts whether the user is home or away. 19

Can a Smart Smoke Detector Call 911?

Do not assume that a smartphone alert means the detector automatically calls emergency services.

Some ecosystems may provide emergency-service assistance through their apps, but this varies by product and service.

The SC5’s First Alert app, for example, can prompt users to call 911 and can connect them to the appropriate dispatch center when calling through the app. 20

A notification alone should never be interpreted as guaranteed professional emergency response.

What Should You Look for in a Smoke Detector With Phone Alerts?

Feature	Importance	Why It Matters
UL certification	Critical	Helps establish that the alarm meets applicable safety standards
Phone alerts	Very important	Provides notifications when you are away
Local audible alarm	Critical	Provides immediate warning inside the home
Smoke + CO detection	Highly useful	Protects against two different hazards
Battery backup	Important	Maintains local alarm operation during power outages
Interconnection	Very useful	Allows multiple alarms to sound together
Low-battery alerts	Useful	Reduces maintenance surprises
End-of-life notification	Useful	Helps ensure old alarms are replaced
Voice alerts	Useful	Identifies the type/location of danger
App test function	Useful	Makes routine testing easier

Smart Smoke Detector Safety Certification

Smart features should never take priority over basic fire-safety certification.

Consumer Reports warns that consumers should look for certification from recognized testing organizations such as UL Solutions or Intertek ETL, particularly because uncertified detectors are sold through major online marketplaces. 21

Always verify the exact model and its current U.S. certification rather than relying solely on an online marketplace description.

How Many Smart Smoke Detectors Do You Need?

Smart connectivity does not change the basic need for adequate smoke-alarm coverage.

The U.S. Fire Administration recommends smoke alarms:

• Inside every bedroom.
• Outside each separate sleeping area.
• On every level of the home.
• Including the basement.

Interconnected alarms are recommended so that when one alarm sounds, the others sound as well.

Should Every Smoke Detector Be Smart?

Not necessarily.

One smart detector can sometimes provide notifications for a larger network of compatible interconnected alarms.

For example, Kidde says its 20SAR-W can provide mobile alerts for every compatible hardwired alarm in a home by adding one smart alarm. 22

Likewise, First Alert’s SC5 can be interconnected with compatible alarms so that when one sounds, the others sound and mobile alerts are generated. 23

This can reduce the cost of adding smart notifications throughout an existing home.

Smart Smoke Detector vs. Traditional Smoke Detector

Feature	Traditional	Smart
Local smoke alarm	Yes	Yes
Phone notifications	No	Yes
Remote status checking	No	Usually
Remote testing	Usually no	Some models
Low-battery phone notification	No	Some models
Smart-home integration	No	Usually
Monthly subscription	No	Usually no for basic alerts
Internet required for local alarm	No	No
Internet required for phone alerts	N/A	Usually

Common Mistakes When Buying Smart Smoke Detectors

• Buying a detector that sends alerts but lacks appropriate safety certification.
• Assuming a phone alert replaces a local audible alarm.
• Assuming Wi-Fi phone alerts will work during every internet outage.
• Ignoring battery backup on hardwired models.
• Assuming all smart alarms can interconnect.
• Mixing incompatible alarm brands or models.
• Buying a smoke-only detector when CO protection is also required.
• Installing too few detectors.
• Failing to replace alarms at the end of their service life.
• Assuming professional emergency monitoring is included.

Frequently Asked Questions

What is the best smoke detector with phone alerts?

The First Alert SC5 is our top overall choice in 2026. It combines smoke and CO detection, mobile alerts, voice warnings, smart interconnection, and battery or hardwired installation options. 24

Can smoke detectors send alerts to your phone?

Yes. Smart smoke detectors can connect to an app and send notifications when smoke or CO is detected. Consumer Reports identifies smartphone alerts as a feature of smart smoke and CO detectors. 25

What is the best smart smoke detector in 2026?

The First Alert SC5 is one of the strongest current choices because First Alert specifically designed it as a connected smoke-and-CO system and as a replacement for Nest Protect. 26

Does the First Alert SC5 send alerts to your phone?

Yes. The First Alert app can send mobile alerts when smoke or CO is detected. It can also provide early-warning notifications and maintenance information. 27

Does the First Alert SC5 work without Wi-Fi?

The local alarm can still provide an audible warning, but cloud-based smartphone notifications generally depend on the detector’s network and internet connection.

Can I get phone alerts from my existing smoke detectors?

Yes, depending on the system. A smart monitor such as the Kidde RemoteLync can be used to add connected monitoring to existing alarms, while some smart alarms can provide notifications for compatible interconnected detectors.

Do smart smoke detectors require a subscription?

Basic phone-alert functionality does not necessarily require a monthly subscription. However, services vary by manufacturer, so check the current terms before buying.

Are smart smoke detectors worth it?

They can be worthwhile if you want to know about an alarm while away from home. The biggest benefit is remote notification rather than necessarily better basic smoke detection.

Is a smart smoke detector better than a regular smoke detector?

Not automatically. A smart detector adds connectivity and convenience. The underlying smoke-detection performance, certification, installation, placement, and maintenance remain critical.

Can a smart smoke detector detect carbon monoxide?

Only if it contains a CO sensor. The First Alert SC5, for example, is a combination smoke-and-CO detector. A smoke-only smart detector such as the Kidde 20SAR-W does not replace a dedicated CO detector. 28

Final Verdict

The First Alert SC5 is the best overall smoke detector with phone alerts for most U.S. homeowners. It provides smoke and CO detection, mobile alerts, voice warnings, smart interconnection, and both battery and hardwired versions. 29

For a smoke-only hardwired system, the Kidde 20SAR-W is a strong choice, particularly if you already have compatible Kidde interconnected alarms. Kidde says one smart alarm can extend mobile alerts to compatible hardwired alarms throughout the home. 30

For homeowners wanting additional indoor-air information, the Kidde P4010ACSAQ-WF is worth considering. For Ring or Z-Wave users, the First Alert Z-Wave Plus model can make more sense because it integrates into an existing smart-home ecosystem.

The key point is that phone alerts should be considered an additional layer of protection, not a replacement for properly installed local smoke alarms. Choose a certified detector, install enough alarms throughout the home, maintain the backup batteries, and make sure your smart system remains connected.

Sources

Product specifications and current smart-alert capabilities were checked against manufacturer information from First Alert, Kidde, and Google, while current independent testing was checked against Consumer Reports’ 2026 smoke and CO detector testing.