Smoke and carbon monoxide alarms for short-term rentals in 2026

Smoke and CO detectors STR hosts should actually install in 2026

A smoke or CO alarm that triggers in an empty rental is only useful if someone finds out. For operators managing properties remotely, the gap between an alarm sounding on-site and the host learning about it is where the real exposure sits — an alarm nobody responsible hears gives a remote host no warning at all.

Most consumer detectors are built for a homeowner who sleeps down the hall from the unit. A detector suited to short-term rentals has different demands: it has to survive constant turnover without maintenance calls, it has to fit whatever the local code and the building’s wiring already require, and depending on the setup it may need to reach a host who is hundreds of miles away. The four alarms below were evaluated on UL listing status, power source and maintenance burden, interconnect capability, and remote-alert support — the things that actually decide whether a detector earns its place in a rental.

If you’re building out a fuller safety stack, pairing detectors with a smart water shutoff covers the same category of risk: damage that happens between guests, with no one watching.

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Best Overall

Kidde 30CUD10-V Combination Smoke & Carbon Monoxide Alarm (10-Year Sealed Battery, Voice)

$69 | 4.2/5 (396 Amazon reviews)

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The 30CUD10-V is Kidde’s current combination alarm with a sealed 10-year lithium battery, designed to eliminate routine battery swaps and low-battery chirps for up to 10 years under normal operating conditions. The voice feature announces whether it’s detecting smoke or carbon monoxide, so a guest who has never seen the unit knows which emergency they’re in. It carries Kidde’s current sensing technology and is tested to the latest UL editions.

STR Use Case: A 10-year sealed-battery combination alarm removes the most common turnover-day nuisance — battery maintenance — while the voice alert tells a guest exactly what hazard the alarm is signaling.

• Sealed 10-year battery is designed to require no routine battery changes during the alarm’s service life, reducing recurring maintenance and the risk of a low-battery chirp during a guest stay
• Voice alerts announce “Fire” or “Carbon Monoxide” so an unfamiliar guest understands the hazard without reading a manual
• Combination smoke and CO detection in one device reduces the number of units to install and maintain per property
• Listed to the applicable UL 217 smoke-alarm and UL 2034 carbon-monoxide-alarm standards

• Con: No remote alerting — the alarm sounds and speaks on-site but will not notify a host who is off the property. There is no interconnect, so in a larger unit each alarm sounds independently.

This is right for you if: You want a low-maintenance, code-aware combination alarm for each protected location and you have a local responder — cleaner, co-host, or neighbor — who can act on an on-site alarm.

Best Budget

Kidde 30CUDR Combination Smoke & Carbon Monoxide Alarm (AA Battery)

$49 | 4.4/5 (2,464 Amazon reviews)

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The 30CUDR is the AA-powered version of the same current Kidde combination platform, at the lowest per-unit cost on this list. It lets a portfolio operator equip several locations per property without a large hardware outlay, while still meeting the current UL editions. The tradeoff is that AA batteries need periodic replacement, so it suits operators with a maintenance routine already in place.

STR Use Case: The lowest-cost current combination alarm here, letting budget-conscious operators meet smoke and CO detection across multiple locations and properties at minimal per-unit cost.

• Lowest per-unit cost on this list, which matters when equipping several locations across a multi-property portfolio
• Same current Kidde sensing technology and UL 217 / UL 2034 listing as the sealed-battery model
• Runs on two AA batteries with no wiring required, simplifying installation and battery service; placement and installation must still follow the manufacturer’s instructions and local code
• Combination smoke and CO detection in a single unit

• Con: AA batteries require periodic replacement, which adds a recurring maintenance task and the risk of a low-battery chirp during a stay. No interconnect and no remote alerting.

This is right for you if: You’re equipping a portfolio on tight unit economics, you have a maintenance routine that handles battery replacement, and a local responder is available for on-site events.

Best for Remote Alerts

First Alert SC5 Smart Smoke & Carbon Monoxide Alarm, Model SMCO600NV (Battery)

$129 | 3.5/5 (435 Amazon reviews)

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The First Alert SC5 is the officially recommended replacement for Google’s discontinued Nest Protect, and it’s the only alarm here that can reach a host who isn’t on the property. When it detects smoke or CO, it sends a push notification through the First Alert app (it also works in the Google Home app), so a remote operator learns about an event rather than relying on a guest or neighbor to report it. It also gives voice alerts on-site and can wirelessly interconnect with other SC5 alarms and compatible Nest Protect units listed by First Alert.

STR Use Case: Sends a remote app notification to a host when smoke or CO is detected in an unoccupied property, closing the visibility gap that on-site-only alarms leave during vacant periods.

• The only alarm in this comparison that can send the host a remote app notification when smoke or CO is detected
• Voice alerts on-site announce the hazard type and location, and the unit interconnects with other SC5 alarms and compatible Nest Protect models listed by First Alert (Nest Protect compatibility requires the Google Home app and a Google Account)
• Positioned by First Alert as a replacement for the discontinued Nest Protect and designed to integrate with compatible existing Nest Protect alarms
• The app provides device status, battery information, and a remote test function, which helps a host identify some maintenance issues without being on-site

• Con: Remote alerts depend on a working internet connection and powered network equipment. The battery-operated alarm continues local smoke and CO detection during an outage, but a router or internet failure can prevent notifications from reaching the host. First Alert does not advertise professional monitoring for this model, so a missed push notification has no monitoring-service fallback. It also has the highest cost per unit on this list, and its current Amazon rating is the lowest of the four picks — worth reading recent buyer reviews before committing at scale.

This is right for you if: You manage properties remotely, maintain reliable property Wi-Fi, and have a local responder who can investigate an alert or provide emergency access when needed. App alerts inform you; they do not replace someone able to reach the property.

Best for Interconnected Coverage

First Alert SMCO500V Wireless-Interconnect Combination Smoke & CO Alarm (Battery, Voice)

$52 | 4.2/5 (306 Amazon reviews)

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The SMCO500V gives you interconnected alarms — when one detects smoke or CO, every linked unit sounds — over a wireless RF link rather than wiring. That matters in a multi-floor rental, where a guest asleep upstairs may not hear an alarm that sounds only in the basement. Because the interconnect is wireless and the units are battery-powered, you get that whole-property coverage without an electrician, which is the practical advantage over hardwired interconnect for most existing rentals. Voice and location alerts announce which unit and which hazard.

STR Use Case: Wireless interconnect makes every alarm in a multi-room unit sound together when one detects a hazard, giving guests in any part of the property an early warning — without the wiring an electrician would otherwise install.

• Wireless RF interconnect links multiple alarms so they sound together; a hazard detected in one room alerts the whole property
• Battery-powered, so the interconnected coverage installs without an electrician — the practical advantage over hardwired interconnect in an existing rental
• Voice and location alerts identify which unit detected the hazard and whether it is smoke or CO
• Combination smoke and CO detection in each unit, with First Alert’s current Precision Detection sensing

• Con: Interconnect is local only — linked alarms sound on-site but do not send remote phone alerts, which require a separate compatible smart-alarm system. The unit uses two replaceable AA batteries rather than a sealed 10-year cell. Verify compatibility with every existing First Alert or BRK alarm before mixing models, and do not assume it interconnects with the SC5 — First Alert directs buyers to the manual for the exact list of compatible alarms.

This is right for you if: You operate a larger or multi-floor rental where alarms should sound together, you can’t or don’t want to run interconnect wiring, and your local code accepts wireless-interconnected battery alarms.

10-year sealed, AA, hardwired, or wireless-interconnect: which fits a rental

The power and interconnect choice usually comes down to who maintains the property and what the building already has. A 10-year sealed-battery alarm runs on a non-replaceable lithium cell for the life of the unit, then gets replaced around year ten. There are no battery swaps, which removes the most common turnover nuisance — the low-battery chirp a guest hears at 2am and reports as a defect. For an operator working through cleaners or managing remotely, that matters more than it looks on paper. An AA-powered unit costs less up front but reintroduces the battery-maintenance task and the chirp risk.

Interconnect is a separate question from power. Interconnected alarms all sound when one detects a hazard, which is a genuine safety gain in a multi-floor rental where a guest may not hear a single distant alarm. Hardwired interconnect ties units together over wiring and usually needs an electrician, which rules it out for many existing rentals. Wireless interconnect links battery units over radio instead, delivering the same all-sound behavior without rewiring — usually the more practical path for a host who can’t alter the building. Interconnection alone does not send a remote phone alert; that requires separate Wi-Fi-connected smart capability, such as the remote-alert functionality built into the SC5.

The practical split: a sealed-battery combination alarm in each location suits most existing rentals where low maintenance is the priority; wireless-interconnected units suit larger or multi-floor properties that need alarms to sound together; hardwired interconnect suits new builds, gut renovations, or properties where local code already requires it; and a smart alarm covers the case where the host needs to know about an event from off-site. Many jurisdictions require a specific arrangement for rentals, so the building’s wiring and the local rule often make the decision before host preference does.

What to look for in a short-term-rental smoke and CO alarm

Recognized safety listings are the starting point, but they do not establish property-level compliance by themselves. UL 217 (smoke) and UL 2034 (CO) are the listings code authorities and insurers commonly reference, and every alarm here carries them — but the required alarm type, placement, quantity, power source, interconnection, and replacement schedule still depend on local code and the specific property. Verify the rules that apply to your unit with the local authority and your insurer before buying.

Remote alerting is the feature operators tend to underestimate until they need it. A Wi-Fi-connected alarm that pushes a notification to your phone closes the visibility gap while a unit is empty — but only while the property’s Wi-Fi and power are up. A smart alarm informs a remote host; it does not replace someone who can physically reach the property, and a router reboot during a gap day can interrupt the alerting entirely.

Interconnect requirements vary by jurisdiction and by factors such as property age, construction type, and renovation history. Some properties are required to have alarms that sound together; others are not. Verify the rules that apply to the specific property before deciding between single-unit, wireless-interconnected, or hardwired alarms.

How we evaluated these products

Every alarm here was assessed for what it does for an operator who is not standing in the property when something goes wrong: UL listing status, power source and the maintenance it implies, interconnect capability, and remote-alert support. This comparison focuses on combination smoke and CO alarms to reduce the number of devices an operator maintains; separate smoke and CO alarms may still be appropriate or required depending on property layout and local code. Coverage of features and standards is drawn from each manufacturer’s current published specifications; product availability and certification editions can change, so confirm the current listing before purchase.

For operators also evaluating the broader smart-home stack, the same reliability standard applies to every connected device at the property, including the smart locks guests use at check-in. A connected detector is only as dependable as the network behind it.

*As an Amazon Associate, REWire Media earns from qualifying purchases. This article contains affiliate links and we may earn a commission at no additional cost to you. Amazon links use tag rewiremedia-20. Prices and ratings shown are as of publication and change over time. Smoke and CO alarms are life-safety devices; check each alarm’s manufacture date on delivery, follow the manufacturer’s placement and replacement guidance, and confirm local code requirements for your property.*