Expert’s Rating
Pros
- Petite, unobtrusive {hardware}
- Wi-Fi connectivity and interconnected options work properly
- Very inexpensive
Cons
- Doesn’t detect the presence of carbon monoxide
- No battery backup on the hub; any energy outage means no push notifications
- We encountered a minor operational drawback throughout testing
Our Verdict
This three-alarm smoke detection system presents seamless, long-range interconnectivity and Wi-Fi assist, providing you with further layers of fireside safety.
Price When Reviewed
This worth will present the geolocated pricing textual content for product undefined
Best Pricing Today
Price When Reviewed
$109.99
Best Prices Today: X-Sense XS01-M Interconnected Smart Smoke Alarm (mannequin FS31)
$109.99
The hassle with smoke alarms is that one alone often doesn’t present sufficient safety, even in smaller houses. An alarm that goes off in a single room may not be heard in the remainder of the home, obviating your entire level of the expertise.
Interconnected smoke alarms supply an answer: If one goes off, they all go off. But the expertise both means having devoted wiring put in or standardizing on a wi-fi interconnectivity platform and hoping your mesh of alarms are all in vary of each other.
Specifications
The new XS01-M Interconnected Smart Smoke Alarm smoke alarm system (X-Sense mannequin quantity FS31) offers the wi-fi interconnect idea an improve by placing a base station in the midst of the mesh. That station doesn’t simply coordinate the satellite tv for pc smoke alarms (it must be famous that these alarms will not detect dangerous accumulations of carbon monoxide), it additionally connects to your own home Wi-Fi community (2.4GHz solely) and relays info to the X-Sense app in your sensible telephone.
The X-Sense FS31 system labored precisely as promised, regardless of a wealth of interfering partitions, flooring, doorways, electrical wiring, plumbing, and metallic electronics between its three satellites.
The satellites are modified variations the X-Sense XS01-WT smoke alarm I reviewed within the spring of 2021, bearing the mannequin quantity XS01-M. They look equivalent to the standalone XS01-WT, with the one actual distinction being the addition of an inside 915MHz radio that’s used for inter-alarm communications. Three satellites include the bottom station within the field (a 5-station model can be obtainable for $140). A most of 24 satellites will be supported on one community, with add-on detectors priced at $30 every ($20 every at Amazon at press time).

The unobtrusive hub of the X-Sense XS01-M Interconnected Smart Smoke Alarm system.
Christopher Null/Foundry
The base station, smaller than you would possibly assume at simply 3.5 inches sq., is powered by a USB-C connection. Note that it doesn’t carry a battery backup, so if the facility goes out, your cell notifications will go darkish; think about plugging the hub into an uninterruptible energy provide simply in case. Each satellite tv for pc is powered by an included (and replaceable) 3V lithium cell. The preinstalled batteries promise a 5-year working life, and the alarm itself boasts a 10-year working life earlier than it should be retired.
Installation and setup
Setup is a multi-step affair, and the method is just not instantly apparent, because the X-Sense app instructs you to scan a QR code on the again of the handbook to start registration. But that didn’t work for me, and ultimately I stumbled my approach by way of the app to discover a display screen for including the smoke alarms instantly, primarily based on their mannequin quantity. Again, the app doesn’t point out the right way to add the bottom station however trying so as to add an alarm prompts you to first onboard the bottom station by scanning a QR code on its underside.
Once the bottom station has been added to the app, you’ll be able to proceed so as to add the alarms, separately, by activating their respective batteries and urgent a pairing button on the aspect of every gadget. I encountered no hassle with this a part of the method.
Performance

You can add as much as 21 further X-Sense XS01-M smoke alarms to the FS31 system, however remember these don’t detect the presence of dangerous ranges of carbon monoxxide.
Christopher Null/Foundry
The X-Sense FS31’s large promoting level is in fact the alarms’ interconnectivity, so I examined the gadgets by putting them within the furthest corners of my home, after which utilizing the X-Sense app’s check function to set off an alarm that ought to, in concept, trigger all of them to pontificate. Sure sufficient, the system labored precisely as promised, regardless of a wealth of interfering partitions, flooring, doorways, electrical wiring, plumbing, and metallic electronics between the three satellites.
X-Sense claims a 500-meter (1,640 ft) most vary in open air, and although my residence is just not practically that enormous, the system appeared greater than succesful at blanketing my total home with protection.
The sirens are very loud and piercing, and three totally different siren types can be found, so you’ll be able to customise totally different alarms with totally different sounds if desired. The quantity of the alarm on the bottom station will be set, however all siren alarms stay at most quantity regardless.
Each satellite tv for pc alarm will also be configured to ship quite a lot of totally different notifications to your telephone, together with when alarms are triggered or finish; when a tool is silenced, examined, or malfunctions; low battery notifications; and offline notifications. Push notifications had been efficiently despatched to each my telephone and my e mail inbox.

The X-Sense app offers you an at-a-glance have a look at all of your alarms’ standing and shows push notifications if the system goes into an alarm state.
Christopher Null/Foundry
I additionally examined the alarms with simulated smoke and located they alerted shortly when uncovered to the hazard and stopped sounding promptly when the smoke cleared, with push notifications (and an e mail) being pushed out in seconds. Finally, I additionally examined the alarms with the bottom station disconnected. When one alarm was uncovered to smoke, every of the opposite alarms nonetheless activated, even with out the central hub to coordinate them. The solely distinction being that push and e mail notifications weren’t despatched (with the app displaying all gadgets offline). The absence of battery backup on the hub looks as if a missed alternative.
The X-Sense app offers you reasonable flexibility in how the system works, together with the choice to silence an alarm by urgent a button on the bottom station. (With this feature off, an alarm can solely be silenced by the app or by disconnecting the facility plug.) These choices are all very simple and self-explanatory.
I had no hassle with X-Sense’s system till at one level, one of many satellite tv for pc alarms dropped offline with out warning, disconnecting from the community. X-Sense presents no actual troubleshooting choices for this occasion—suggesting solely that it is best to simply transfer the alarm nearer to the bottom station—however even after I put them a couple of ft aside, the alarm stayed offline, regardless of force-quitting the app and power-cycling each the alarm and the bottom station.
The solely repair I used to be ever capable of finding was deleting the troubled alarm from the app and re-adding it by way of the onboarding course of. It has remained linked ever since.

For the value of a subscription, you’ll be able to join the X-Sense system to a third-party skilled monitoring service that may dispatch your native fireplace division ought to smoke be detected.
Christopher Null/Foundry
In the U.S., X-Sense presents a subscription service called the Protect+ Premium (that’s the corporate’s footnote marker on the finish of “Protect”, though there’s no footnote on the web page I’ve linked to). The service will routinely dispatch first responders if one among its alarms is triggered. The service, administered by the third-party monitoring firm Noonlight, takes steps to keep away from sending a hearth truck primarily based on a false alarm, beginning with a written message. If there’s no response inside 20 seconds, a telephone name is initiated. If there’s no reply to that decision inside 60 seconds, a hearth truck is dispatched.
Protect+ Premium prices $5/month or $50/yr. There’s additionally a $3/month, $30/yr Protect+ Basic plan, which requires you to request a fire-engine dispatch by urgent a button within the app when one of many smoke alarms sounds off. Neither plan is one thing I’d spend money on, however you would possibly really feel in any other case.
Should you purchase an X-Sense XS01-M Interconnected Smart Smoke Alarm
Despite the lone operational hiccup, the X-Sense FS31 system labored properly in my testing, the assorted {hardware} elements are petite and unobtrusive, and the value—on sale at Amazon for just $70 as of this writing—is wholly affordable.
You’ll want another technique of warning residents of the presence of carbon monoxide in your house, however this interconnected smoke alarm system is a robust fire-safety instrument.