For frequent travelers
The Best Smart Smoke & CO Detectors for Travelers (2027)
The best smart alarms for 2027 for owners who travel: phone alerts, self-tests, and remote silencing that work from anywhere.
The short answer
Travelers should choose Nest Protect in 2027 for self-testing and the clearest remote alerts. Hub homes should route alerts through the ZCOMBO instead.
Our top picks at a glance
- Google Nest Protect (2nd Gen)The premium split-spectrum alarm that speaks, self-tests, and lights your path.Best remote confidence
- Kidde Smart Smoke & CO Detector 30CUAR-WKidde hardwired smart combo alarm with voice alerts and app notifications.Best mid-price alerts
- First Alert Z-Wave Smoke & CO Alarm ZCOMBOThe hub-home combo alarm: Z-Wave alerts through Ring Alarm or SmartThings, no Wi-Fi needed.Best with a security system
- Kidde Smart Smoke & CO Detector with RingThe Ring-connected Kidde combo: hardwired smoke and CO with Ring app alerts.Best Ring-connected combo
- First Alert Onelink Safe & SoundA hardwired smoke and CO alarm that doubles as an Alexa smart speaker.Best hardwired upgrade
- X-Sense XS0B-MR121 Smart Smoke Detector with Base StationA Wi-Fi smoke alarm kit with voice location alerts and an SBS50 base station.Best budget Wi-Fi smoke
- Kidde Smart CO AlarmPlug-in smart CO detection with battery backup and app alerts for furnace rooms.Best dedicated CO
- X-Sense SC07-W Wireless InterconnectedInterconnected combo alarms that all sound together, with a 10-year sealed battery.Best interconnected battery set
What owners report
Synthesized from recurring themes in long-term owner feedback.
Most praised
- Getting a smoke or carbon monoxide alert on a phone abroad turns a possible disaster into a call to a neighbour
- Checking every room shows green from an airport lounge is the calm travellers in this group pay for
Common complaints
- An app alert from another continent is only useful with a neighbour or service who can act on it
- A router or power blip at home can leave alarms offline until someone returns to re-pair them
The picks, ranked
Every product in this lineup was picked for this use case, ranked with our strongest choices first. If a product from the wider category does not genuinely fit this scenario, it is not listed here.
| # | Product | Award | Sensors | Power | Connectivity | Lifespan | Certification |
|---|---|---|---|---|---|---|---|
| 1 | Google Nest Protect (2nd Gen) | Best remote confidence | Split-spectrum smoke, CO, humidity, temperature, occupancy | Battery (6 AA lithium) or hardwired 120V model | Wi-Fi, Thread interconnect between Protects | 10 years, CO sensor rated 10 years | UL 217 and UL 2034 listed |
| 2 | Kidde Smart Smoke & CO Detector 30CUAR-W | Best mid-price alerts | Photoelectric smoke, electrochemical CO | Hardwired with 2 AA battery backup (included) | Kidde app enabled, interconnected | - | - |
| 3 | First Alert Z-Wave Smoke & CO Alarm ZCOMBO | Best with a security system | Photoelectric smoke, electrochemical CO | 2 AA batteries | Z-Wave (hub required) | 7 to 10 year sensor life by model date | UL 217 and UL 2034 listed |
| 4 | Kidde Smart Smoke & CO Detector with Ring | Best Ring-connected combo | Smoke and carbon monoxide | Hardwired with AA battery backup | Ring app enabled | - | - |
| 5 | First Alert Onelink Safe & Sound | Best hardwired upgrade | Photoelectric smoke, electrochemical CO | 120V hardwired with battery backup | Wi-Fi, Bluetooth; Alexa built in | 10-year alarm life | UL 217 and UL 2034 listed |
| 6 | X-Sense XS0B-MR121 Smart Smoke Detector with Base Station | Best budget Wi-Fi smoke | Photoelectric smoke only | Battery powered alarms; base station plug-in | Wi-Fi via SBS50 base station, wireless interconnect | - | - |
| 7 | Kidde Smart CO Alarm | Best dedicated CO | Electrochemical carbon monoxide | 120V plug-in with battery backup | Wi-Fi 2.4GHz | 10-year alarm life | UL 2034 listed |
| 8 | X-Sense SC07-W Wireless Interconnected | Best interconnected battery set | Photoelectric smoke, electrochemical CO | 10-year sealed lithium battery | RF wireless interconnect (868/915MHz by region) | 10 years | UL 217 and UL 2034, EN standards by region |
Best remote confidence
Google Nest Protect (2nd Gen)
The premium split-spectrum alarm that speaks, self-tests, and lights your path.
Nightly Promise self-tests plus instant phone alerts with room and threat spoken in the home. Protect is the alarm travelers check from the airport and trust.
Strengths
- Split-spectrum photoelectric sensor reduces cooking false alarms
- Voice alerts name the room and threat before the siren
- Silence from the app when you are nearby
- Nightly Promise self-check and a pathlight that glows on motion
Limitations
- Premium price multiplies across a whole home
- 10-year sealed life means full unit replacement at expiry
- Google Home migration left some legacy Nest app users frustrated
| Sensors | Split-spectrum smoke, CO, humidity, temperature, occupancy |
|---|---|
| Power | Battery (6 AA lithium) or hardwired 120V model |
| Connectivity | Wi-Fi, Thread interconnect between Protects |
| Lifespan | 10 years, CO sensor rated 10 years |
| Certification | UL 217 and UL 2034 listed |
Best for: Homes wanting the best app alerts, voice alarms, and nuisance-alarm intelligence.
Skip if: Budget matters; Protect costs several times a basic smart alarm per room.
Best mid-price alerts
Kidde Smart Smoke & CO Detector 30CUAR-W
Kidde hardwired smart combo alarm with voice alerts and app notifications.
Hardwired combo sensing with app alerts gives remote owners emergency awareness at half the Nest trajectory per room.
Strengths
- Photoelectric smoke plus electrochemical CO sensing in one unit
- Voice alerts announce the threat in the home
- Kidde app enabled for remote status and notifications
- Interconnects with other compatible Kidde alarms
Limitations
- Hardwired install; not a battery-only retrofit
- Backup batteries are replaceable AA cells, not a sealed 10-year pack
- App features depend on a Kidde account and home Wi-Fi
| Sensors | Photoelectric smoke, electrochemical CO |
|---|---|
| Power | Hardwired with 2 AA battery backup (included) |
| Connectivity | Kidde app enabled, interconnected |
| Dimensions | 5 x 5 x 2 in, 1.3 lb |
| Model | 30CUAR-W |
Best for: Families wanting Kidde alarm credibility plus app alerts in hardwired locations.
Skip if: You have no alarm wiring boxes; this model is hardwired with battery backup.
Best with a security system
First Alert Z-Wave Smoke & CO Alarm ZCOMBO
The hub-home combo alarm: Z-Wave alerts through Ring Alarm or SmartThings, no Wi-Fi needed.
If a monitored Ring or SmartThings setup already watches the house, ZCOMBO alerts ride that trusted channel instead of adding another app to check abroad.
Strengths
- Integrates alarms into Ring Alarm and SmartThings automations
- Battery powered, mounts anywhere without wiring
- Photoelectric smoke plus electrochemical CO in one unit
- Hub alerts work even though the alarm itself is not Wi-Fi
Limitations
- Requires a compatible Z-Wave hub for any smart feature
- No voice or room-naming alerts
- Not a primary Ring Alarm monitored sensor in all configurations, check your plan
| Sensors | Photoelectric smoke, electrochemical CO |
|---|---|
| Power | 2 AA batteries |
| Connectivity | Z-Wave (hub required) |
| Lifespan | 7 to 10 year sensor life by model date |
| Certification | UL 217 and UL 2034 listed |
Best for: Ring Alarm and SmartThings homes wanting alarms inside the security system.
Skip if: You have no Z-Wave hub; this alarm has no standalone app.
Best Ring-connected combo
Kidde Smart Smoke & CO Detector with Ring
The Ring-connected Kidde combo: hardwired smoke and CO with Ring app alerts.
For Ring households, this Kidde puts smoke and CO alerts in the same Ring app as the doorbell and cameras, so one check abroad covers the whole house.
Strengths
- Smoke plus CO sensing from a traditional alarm brand
- Ring app enabled alerts alongside Ring cameras and doorbells
- Hardwired reliability with AA battery backup
- One app for security and life-safety alerts
Limitations
- Premium pricing for the Ring-connected model
- Hardwired install only; no battery-only version
- Smart features center on the Ring app ecosystem
| Sensors | Smoke and carbon monoxide |
|---|---|
| Power | Hardwired with AA battery backup |
| Connectivity | Ring app enabled |
| Model | RGCUAR-RW |
| Brand | Kidde |
Best for: Ring households wanting combo alarms that report inside the Ring app.
Skip if: You have no hardwired alarm boxes, or no interest in the Ring ecosystem.
Best hardwired upgrade
First Alert Onelink Safe & Sound
A hardwired smoke and CO alarm that doubles as an Alexa smart speaker.
Safe and Sound sends First Alert app alerts for smoke and CO while you travel, and the built-in Alexa lets the house answer back through the ceiling speaker.
Strengths
- Built-in Alexa speaker for music and voice in alarm locations
- Photoelectric smoke plus electrochemical CO sensing
- Hardwired interconnect with other Onelink and many BRK alarms
- Adaptive nightlight and strong First Alert app alerts
Limitations
- Hardwired only; no battery-only version
- Discontinued-line risk: verify current stock and support before whole-home buys
- Speaker features raise the price well above alarm-only rivals
| Sensors | Photoelectric smoke, electrochemical CO |
|---|---|
| Power | 120V hardwired with battery backup |
| Connectivity | Wi-Fi, Bluetooth; Alexa built in |
| Lifespan | 10-year alarm life |
| Certification | UL 217 and UL 2034 listed |
Best for: Hardwired homes wanting Alexa in the ceiling plus premium alarm features.
Skip if: You lack hardwired alarm boxes; Safe and Sound is AC-powered only.
Best budget Wi-Fi smoke
X-Sense XS0B-MR121 Smart Smoke Detector with Base Station
A Wi-Fi smoke alarm kit with voice location alerts and an SBS50 base station.
The budget remote option: the base station pushes phone alerts for smoke, with voice location in the home. It is smoke only, so pair it with a CO alarm for full travel coverage.
Strengths
- Wi-Fi phone alerts through the included SBS50 base station
- Voice alerts name the location across 17 preset locations
- Wireless interconnect: when one alarms, the set sounds together
- Test and silence from the X-Sense app
Limitations
- Smoke only; no CO sensor
- Phone alerts route through the base station, not direct Wi-Fi
- Base station needs its own outlet and 2.4GHz Wi-Fi
| Sensors | Photoelectric smoke only |
|---|---|
| Power | Battery powered alarms; base station plug-in |
| Connectivity | Wi-Fi via SBS50 base station, wireless interconnect |
| Alerts | Voice location alerts, app notifications |
| Model | XS0B-MR (kit XS0B-MR121) |
Best for: Apartments and homes needing phone smoke alerts cheaply; smoke only, pair with a CO alarm.
Skip if: You need CO sensing in the same unit; the XS0B-MR is smoke only.
Best dedicated CO
Kidde Smart CO Alarm
Plug-in smart CO detection with battery backup and app alerts for furnace rooms.
CO is the silent travel risk from furnaces and water heaters; this plug-in Kidde sends Wi-Fi app alerts for CO events specifically, complementing the smoke alerts of the combo units.
Strengths
- Dedicated electrochemical CO sensing with digital display lineage
- Plug-in power with battery backup rides out outages
- Wi-Fi app alerts for CO events away from home
- Peak-level memory helps diagnose intermittent furnace issues
Limitations
- CO only; pair with smoke alarms for full coverage
- Occupies an outlet near the floor or appliance
- Smart features depend on Kidde app availability in your region
| Sensors | Electrochemical carbon monoxide |
|---|---|
| Power | 120V plug-in with battery backup |
| Connectivity | Wi-Fi 2.4GHz |
| Lifespan | 10-year alarm life |
| Certification | UL 2034 listed |
Best for: Homes adding connected CO coverage near fuel-burning appliances.
Skip if: You need smoke sensing too; this is a CO-only device by design.
Best interconnected battery set
X-Sense SC07-W Wireless Interconnected
Interconnected combo alarms that all sound together, with a 10-year sealed battery.
On its own the SC07-W network sounds the whole house; add the SBS50 base station path and the set gains phone alerts, which is the configuration travelers should buy.
Strengths
- Wireless interconnect: one alarm triggers all units
- 10-year sealed lithium battery, zero battery chores
- Photoelectric smoke plus electrochemical CO
- Multi-packs price whole-home coverage reasonably
Limitations
- Remote phone alerts require the optional base station ecosystem
- Brand app ecosystem is younger than Nest or Kidde
- No voice location announcements
| Sensors | Photoelectric smoke, electrochemical CO |
|---|---|
| Power | 10-year sealed lithium battery |
| Connectivity | RF wireless interconnect (868/915MHz by region) |
| Lifespan | 10 years |
| Certification | UL 217 and UL 2034, EN standards by region |
Best for: Multi-story homes needing whole-house sounding without hardwiring.
Skip if: You want phone alerts out of the box; interconnect is RF, app needs the SBS50 base on supported setups.
Questions, answered
Can I silence an alarm remotely?
Nest allows app silencing when your phone is on the home network or nearby by design; fully remote silencing is restricted for safety on most systems. A house-sitter plan remains wise.
Will alerts work if home Wi-Fi dies while I travel?
No phone alert survives a dead connection. Choose alarms whose local siren and interconnect protect occupants and neighbors regardless, as all picks here do.
Should travelers add a listening sensor instead?
Sound-listening add-ons are cheaper but cannot distinguish CO and depend on the dumb alarm battery. Connected alarms report their own health, which is the point of remote ownership.
Do I need professional monitoring?
Not for the alarms themselves. If you want responders dispatched automatically, route alarms through a monitored system like Ring Alarm where supported.