6 Best X-Sense Smoke and CO Detectors (November 2026)

The best X-Sense combination smoke and CO detectors include the Kidde Smoke & Carbon Monoxide Detector for hardwired replacement, the Kidde Smart Smoke & CO Detector for app alerts, and the X-Sense Smoke Detector Carbon Monoxide Detector Combo for standalone use.

On this page (4 sections)

1. Which X-Sense combination smoke and CO detector fits your home?
2. What should you compare before choosing a model?
3. How we researched these smoke and CO alarms
4. Which X-Sense smoke and CO detector should you choose?

The best X-Sense combination smoke and CO detector for most homes is the XP0H-WN 3-pack, which runs on sealed 10-year batteries and makes interconnected alarms sound together. Choose the SC07 for one standalone location, the SC01-W for a stated wireless range, or the five-alarm kit when you need more units.

The main choice is how you want the alarms powered and connected. X-Sense options here include standalone and wirelessly interconnected battery-powered alarms, while the two Kidde picks offer hardwired backup or app-based features.

For a broader overview of what a smoke alarm does, start with the basics before deciding how many alarms your home needs. This guide compares the listed models by power, connectivity and alert features.

Our picks at a glance

1. 1
   Best for hardwired replacement

   Kidde Smoke & Carbon Monoxide Detector

   9.7/10 our score

   See it on Amazon
2. 2
   Best for app alerts

   Kidde Smart Smoke & CO Detector

   9.6/10 our score

   See it on Amazon
3. 3
   Best for standalone use

   X-Sense Smoke Detector Carbon Monoxide Detector Combo

   9.5/10 our score

   See it on Amazon

4. 4

   X-Sense Wireless Combination Smoke and CO Detector

   Best for a 3-alarm setup
   Check it
5. 5

   X-Sense Interconnected Smoke Carbon Monoxide Detector Kit

   Best for five locations
   Check it
6. 6

   X-Sense Interconnected Smoke and CO Detector Combo

   Best for multi-floor coverage
   Check it

Which X-Sense combination smoke and CO detector fits your home?

The XP0H-WN 3-pack is the strongest general choice when you want several alarms to sound together without wiring. The SC07 is simpler for a single standalone location, while the SC01-W offers a stated wireless range and the kit bundles five alarms with a remote.

We compared the models by their stated power source, connection type and alert features. Scores reflect how well those features match the search for an X-Sense combination smoke and CO detector, with the two Kidde alternatives included for readers weighing other power or app needs.

Best X-Sense models by power and connectivity

The key difference is whether you need a standalone alarm, wireless interconnection or phone notifications. Sealed-battery X-Sense alarms avoid routine battery replacement during their stated 10-year life, but the SC07 cannot connect to other alarms.

If a smartphone notification is a priority, note that the X-Sense models described here do not claim Wi-Fi or app alerts. The Kidde Smart model is the app-connected alternative in this comparison.

1

Kidde Smoke & Carbon Monoxide Detector: Best for hardwired replacement

9.7/10Our score

• 120V hardwired power
• 9V battery backup
• Voice alerts for smoke and CO
• Interconnects with up to 24 Kidde devices

A hardwired option with battery backup, voice alerts and compatibility with other Kidde devices. It is useful for a compatible wired setup, but it is not an X-Sense alarm.

See it on Amazon

Pros

• Hardwired with battery backup
• Voice alerts identify fire or carbon monoxide
• Can interconnect with up to 24 Kidde devices

Cons

• Requires a 120V power source
• Designed for Kidde device interconnection

The Kidde Smoke & Carbon Monoxide Detector is the best fit here if you're replacing a compatible hardwired unit. It uses a 120V power source with a 9V battery backup, so it is a different installation choice from the battery-only X-Sense alarms.

Kidde says the alarm uses photoelectric smoke sensing and electrochemical CO sensing. Its 85 dB alarm includes voice alerts that identify “Fire!” or “Warning!

Carbon Monoxide!” The front battery door gives access to the backup battery without removing the unit from the ceiling.

It can interconnect with up to 24 Kidde devices, including smoke, CO and heat alarms. That limit applies to Kidde devices, so check your existing system's compatibility before choosing it as a replacement.

Choose this model when you have the right hardwired connection and want voice alerts. If hardwiring is the main requirement, compare other hardwired combination smoke and CO detectors before selecting a system.

2

Kidde Smart Smoke & CO Detector: Best for app alerts

9.6/10Our score

• 2 AA batteries
• Ring app alerts for smoke, CO and low battery
• Wireless interconnectivity with Kidde alarms
• Alexa notifications

A battery-powered Kidde option for buyers who want mobile alerts through Ring and whole-home notifications among compatible Kidde alarms. It is not an X-Sense model.

See it on Amazon

Pros

• No wiring needed
• Mobile alerts include smoke, CO and low battery
• Can connect with Alexa-enabled devices

Cons

• App features depend on Ring and compatible devices
• Optional 24/7 monitoring requires a separate subscription

The Kidde Smart Smoke & CO Detector is the choice for app notifications among these six picks. It runs on two AA alkaline batteries and can send smoke, CO and low-battery alerts through the Ring app.

The model also offers wire-free interconnectivity with Kidde alarms, so compatible units can notify throughout the home when one alarm sounds. It works with Alexa-enabled devices for notifications, and an optional Ring subscription adds a separate monitoring service.

This is a Kidde alternative, not an X-Sense detector. The connection and app features depend on using compatible devices and services, so check that setup against what you already have before buying.

Choose it if getting phone alerts is more useful to you than an X-Sense wireless alarm that sounds with connected alarms. For more options across brands, see our roundup of the best combination smoke and CO detectors.

3

X-Sense Smoke Detector Carbon Monoxide Detector Combo: Best for standalone use

9.5/10Our score

• Sealed 10-year battery
• Photoelectric smoke and electrochemical CO sensors
• No rewiring required
• Does not support wireless interconnection

The SC07 is a standalone X-Sense alarm with a sealed 10-year battery. It suits a single location where you do not need connected alarms or app alerts.

See it on Amazon

Pros

• No battery changes during its stated 10-year battery life
• No rewiring required
• Smoke and CO sensors in one alarm

Cons

• No wireless interconnection
• No Wi-Fi or base station connection

The X-Sense SC07 suits a room that needs one alarm without any connection to other units. Its sealed lithium battery is designed to power the alarm for 10 years, and no rewiring is required for installation.

The SC07 combines a photoelectric smoke sensor with an electrochemical CO sensor. X-Sense says the sensors respond to slow-smoldering fires and help reduce cooking-related false alarms; those are manufacturer claims, not results from our own tests.

The important limit is connectivity: SC07 is a basic standalone model. It doesn't support wireless interconnection, Wi-Fi or a base station.

If you want alarms in different rooms to sound together, choose a connected model instead.

Pick the SC07 for a straightforward standalone setup. For a home-wide plan, compare it with our guide to wireless interconnected smoke detectors.

4

X-Sense Wireless Combination Smoke and CO Detector: Best for a 3-alarm setup

9.4/10Our score

• Three XP0H-WN alarms
• Sealed 10-year batteries
• Wireless interconnection
• No Wi-Fi or base station support

This three-pack links its alarms wirelessly so they sound together when one detects smoke or CO. It does not connect to Wi-Fi or a base station.

See it on Amazon

Pros

• Three alarms in the pack
• Wireless alerts sound across connected alarms
• No rewiring required

Cons

• No Wi-Fi or base station connection
• The pack is limited to three alarms

The X-Sense XP0H-WN 3-pack is the best balance of wireless coverage and simplicity in this group. Each alarm uses a sealed 10-year battery, and the units interconnect wirelessly so they sound together when one detects smoke or CO.

This connection doesn't use Wi-Fi, and the model cannot connect to a base station. That makes it a fit for buyers who want alarms to communicate with one another but don't need phone alerts or a smart home hub.

The pack includes three alarms, so map their locations before deciding if it covers your home. X-Sense also includes a large mounting bracket intended to cover a wider area than a small bracket; check its dimensions against your existing alarm location.

Choose this set for a small or medium setup where three connected alarms are enough. If your plan needs more units and a remote, the five-alarm kit below may suit you better.

5

X-Sense Interconnected Smoke Carbon Monoxide Detector Kit: Best for five locations

9.3/10Our score

• Five XP0H-WN alarms
• RC01 Pro remote control
• Sealed 10-year batteries
• Real-time CO level display

The kit combines five XP0H-WN alarms with an RC01 Pro remote for a larger setup. Its alarm display shows real-time CO levels, battery level and working status.

See it on Amazon

Pros

• Five combination alarms
• Remote control can test or silence alarms
• Display shows CO levels and working status

Cons

• No Wi-Fi connection is stated
• A five-alarm kit may exceed a smaller home's needs

The X-Sense kit is designed for buyers who want five alarms and a remote in one package. It includes five XP0H-WN combination alarms and an RC01 Pro remote control.

The alarms have sealed 10-year batteries and interconnect wirelessly. The display shows real-time carbon monoxide levels, battery level and working status, while the remote can test or silence alarms.

The larger pack may be more than you need if you're replacing one alarm or covering a small area. Plan placements and check that the XP0H-WN setup fits your existing alarms before choosing a five-unit kit.

Choose it when the number of alarms and remote access matter more than Wi-Fi features. It is a better match for a planned multi-room setup than for someone who only needs one replacement.

6

X-Sense Interconnected Smoke and CO Detector Combo: Best for multi-floor coverage

9.1/10Our score

• Three SC01-W alarms
• Sealed 10-year batteries
• Links up to 18 alarms wirelessly over 820 ft
• No Wi-Fi

The SC01-W three-pack offers wireless interconnection with a stated range for multi-floor homes, basements and detached garages. It does not use Wi-Fi.

See it on Amazon

Pros

• Three alarms in the pack
• Can link up to 18 alarms wirelessly
• No rewiring required

Cons

• No Wi-Fi connection
• Check whether the stated range suits your layout

The X-Sense SC01-W 3-pack is the pick for buyers who want a stated range for wireless interconnection. X-Sense says it can link up to 18 alarms wirelessly over 820 ft, which may help when planning a multi-floor home, basement or detached garage.

Each alarm uses a sealed 10-year battery, and connected alarms sound when one detects smoke or CO. The SC01-W doesn't use Wi-Fi, so its wireless connection is for alarm-to-alarm alerts rather than phone notifications.

The three-pack provides a starting set, while the stated maximum gives room to add compatible alarms. Walls and the shape of a building can affect a wireless setup, so follow the model's instructions when placing units.

Choose the SC01-W if the stated range and option to link more alarms suit your floor plan. For a standalone device, the SC07 is simpler; for an XP0H-WN system with remote control, choose the five-alarm kit.

What should you compare before choosing a model?

Match the alarm's power and connection type to your current setup first. A sealed-battery alarm avoids wiring, while a hardwired model needs a compatible power connection and an app-connected alarm depends on its stated services.

Do you want standalone or interconnected alarms?

A standalone alarm sounds locally, while an interconnected setup can alert you in more than one room. The SC07 is standalone; the XP0H-WN and SC01-W models support wireless interconnection.

Do not assume all brands or model families connect with one another. The Kidde hardwired unit specifies interconnection with Kidde devices, and the Kidde Smart unit describes whole-home connectivity with Kidde alarms.

Confirm compatibility before mixing products.

Do you need phone alerts?

Among these picks, the Kidde Smart model describes Ring app notifications for smoke, CO and low battery, plus Alexa notifications. The X-Sense interconnected models described here sound together but don't claim Wi-Fi or app alerts.

If an alarm sounding across rooms is enough, wireless interconnection may fit. If you need alerts while away, check the exact model's app, network and service requirements before you buy.

Does a smoke and CO alarm detect other gases?

A combination smoke and CO alarm detects smoke and carbon monoxide, not every household gas. Carbon monoxide is CO; carbon dioxide is CO2, and the two names don't refer to the same gas.

Choose a separate detector for a separate hazard. Our guide to detectors for smoke and gas explains how these devices serve different purposes, and our First Alert smoke alarm guide covers another brand option.

How we researched these smoke and CO alarms

We compared the stated power sources, connection features and alert types for each model. The X-Sense options vary from the standalone SC07 to wireless sets with three or five alarms, while the Kidde alternatives add hardwired backup or app notifications.

The scores weigh those features against what a shopper looking for the best X-Sense combination smoke and CO detector is likely to need. They are editorial comparisons, not test results or safety guarantees.

Follow the alarm maker's installation and maintenance instructions, and check local requirements when replacing or adding alarms. A smoke and CO combination unit does not replace a detector made for a different gas or air-quality concern.

Which X-Sense smoke and CO detector should you choose?

Choose the XP0H-WN 3-pack if you want sealed batteries and interconnected alarms without Wi-Fi. Pick the SC07 for one standalone location, the SC01-W for its stated wireless range, or the five-alarm kit when you want a remote and broader coverage.

Choose the Kidde hardwired model when your existing wiring and compatible Kidde system fit its requirements. Pick the Kidde Smart alarm if Ring app alerts matter more than staying within the X-Sense range.

For another comparison, see our guide to smoke detectors versus fire alarms. Check the exact model and compatibility before adding it to your home.

Our top 3 picks at a glance

1. 1
   Best for hardwired replacement

   Kidde Smoke & Carbon Monoxide Detector

   9.7/10 our score

   See it on Amazon
2. 2
   Best for app alerts

   Kidde Smart Smoke & CO Detector

   9.6/10 our score

   See it on Amazon
3. 3
   Best for standalone use

   X-Sense Smoke Detector Carbon Monoxide Detector Combo

   9.5/10 our score

   See it on Amazon

Frequently asked questions

Which X-Sense combination smoke and CO detector is best for most homes?

The XP0H-WN 3-pack is a practical choice if you want three alarms that interconnect wirelessly and run on sealed 10-year batteries. When one detects smoke or CO, all connected alarms sound.

Choose the standalone SC07 if you need one alarm and don't need connected alerts.

Does the X-Sense SC07 connect to other alarms?

No. The SC07 is a standalone alarm and doesn't support wireless interconnection, Wi-Fi or a base station.

For connected alarms, compare X-Sense models such as the XP0H-WN or SC01-W.

Check compatibility before adding alarms to an existing setup.

Do X-Sense wireless smoke and CO alarms need Wi-Fi?

The XP0H-WN and SC01-W support wireless interconnection without Wi-Fi. Connected alarms sound together when one detects smoke or carbon monoxide.

That alarm-to-alarm connection is separate from app alerts, so don't assume these models send notifications to your phone.

Do combination smoke and CO alarms detect carbon dioxide?

No. These combination alarms detect smoke and carbon monoxide, also called CO.

Carbon dioxide, or CO2, is a different gas and isn't the same hazard.

See our guide to the difference between CO and CO2 combination alarms before choosing a device for another air-quality concern.