The best Smart home smoke alarms, compared.
Top pick: AEGISLINK Smart Smoke Alarm with Magnetic Mount, ASW-MR31 Best value: X-Sense XS0B-iR – Highest listing-and-price score, on about £25.49 and 493 reviews. The listing says it does not interconnect. Updated October 2026.
A smart home smoke alarm is a smoke alarm that can also send a phone alert. The sounder in the home is still the safety device. An app does not meet the smoke-alarm duties in England, Scotland, Wales, or Northern Ireland on its own. A mains base station plus radio-linked battery alarms can still sound together if the hub loses the internet. A single alarm can join 2.4 GHz Wi-Fi by itself, and several of those listings say the units do not interconnect. Look for a photoelectric sensor, a clear interlink line, a stated battery type, and a mark such as EN 14604. The checks before you pay are in the [smart home smoke alarm buying guide](/hub/fire-protection/smart-home-smoke-alarm/sub/smart-home-smoke-alarm-buying-guide).
A smart home smoke alarm is a smoke alarm that can also send a phone alert. The sounder in the home is still the safety device.
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Personal buying guide
Question 1 of 2
Do the alarms need to sound together?
The AEGISLINK ASW-MR31 is three photoelectric smoke alarms and a mains base station at £77.99, with 4.8 from 26 amazon.co.uk reviews, and the saved listing’s 26 United Kingdom reviews were the whole sample. The listing says 2.4 GHz only, includes magnetic adhesive pads, and uses CR123A cells that reviewers take the alarm down to change. Reviewers liked phone alerts while away and a magnetic fit that avoided drilling on a suitable surface, and they also called the price high for thin packaging. The product text does not say the alarms are interlinked. One captured review says they do, another says they operate independently, so interlink stays unknown. No EN or BS number is in the product text, and battery life is not proven in these reviews beyond a manufacturer claim of a couple of years that one reviewer had not checked. A high star line on 26 reviews does not confirm that one alarm will set the others off.
Pros
Cons
Best for: You accept an unknown interlink line and you want this three-alarm shape on 2.4 GHz.
Less suitable: You need the listing itself to say the alarms sound together.
Specifications
Common questions
Does it work on 5 GHz Wi-Fi?
No. The listing says only 2.4 GHz Wi-Fi is supported.
Is a base station included?
Yes. The included line is 3 x ASW-MR plus 1 base station.
Does the product text say the alarms are interlinked?
It does not. Reviews disagree, so interlink is not established from the product text.
The X-Sense SD11-MR31 is three smoke alarms, magnetic pads and an SBS50 at £64.59, with 4.6 from 99 amazon.co.uk reviews. The highlight says the alarms are wirelessly interlinked, night mode is listed, and the box includes screws as well as the pads. Reviewers call the magnets strong and the app usable, and some bought it to replace expired Nest Protects. The same highlight says a 10-year life while the batteries are replaceable CR123A cells, so those two lines do not describe the same part. One reviewer needed more smoke from an aerosol can than an older alarm had needed, and a heat alarm bought separately did not match at first. No EN number and no decibel figure are in the capture. London Fire Brigade’s advice is to screw an alarm rather than glue it, and a pad is only as good as the surface. The kit is close in price to the FS31, with a higher star line, a thinner review file, and no standard number.
Pros
Cons
Best for: You want a three-alarm hub kit near £65, and you will screw the brackets if the pad is not suitable.
Less suitable: You are choosing on a printed EN 14604 line, or on a sealed cell.
Specifications
Common questions
Can it be fitted without screws?
The listing includes magnetic adhesive pads as well as brackets and screws.
Is the base station in the box?
Yes. The included list has one SBS50 base station.
Does the highlight say the alarms interlink?
Yes. The item highlight says wireless interlinked.
The X-Sense FS31 puts three photoelectric XS01-M smoke alarms and an SBS50 base station in one box at £63.99, and the amazon.co.uk line is 4.5 from 198 reviews. The listing says those alarms are wirelessly interlinked through the hub, conform to EN 14604, and sound at 85 dB, with the base station listed at 100 dB. Reviewers praise a straightforward app and the fact that one alarm sets the others off, which one household wanted because someone at home is hard of hearing. The same file includes false alarms, a unit that died early, a buyer who did not trust detection after a real-smoke test, and a hub power lead of about a metre. The cells supplied are replaceable CR123A batteries, so this is not a sealed long-life kit, and the hub still needs mains and 2.4 GHz. It is the top pick in this set when you want a stated interlink and a named standard on one mid-price kit. It is the wrong pattern if the alarm that has to meet Scottish guidance must be sealed, or if a rented home in Wales needs mains-linked alarms.
Pros
Cons
Best for: You want three alarms the listing says will sound together, with a phone path through the SBS50.
Less suitable: You need a sealed cell for Scottish guidance, or mains-linked alarms for a rented home in Wales.
Specifications
Common questions
Does this kit interlink?
Yes. The listing says the alarms are wirelessly interlinked through the SBS50 base station, which is in the box.
Does the hub need Wi-Fi?
The listing styles the connection as 2.4 GHz Wi-Fi via the base station. The alarms themselves are battery powered.
Is a standard named?
The listing says the smoke alarm conforms to EN 14604.
The X-Sense SC07-WX is one Wi-Fi smoke and carbon monoxide alarm at £45.99, with 4.4 from 2,304 amazon.co.uk reviews, the largest review file in this set. The product data names a photoelectric smoke sensor and an electrochemical CO sensor, and the app line warns when carbon monoxide exceeds 100 ppm. Reviewers use it as a cheaper stand-in for a Nest, including a phone alert while abroad and a boiler room that needed both sensors, and one said toast did not set it off. The listing says it does not support interconnect and is not compatible with the SBS50, though one UK review claims the opposite. One replaceable CR123A is included, pairing was hard for some buyers, and two units were called faulty after setup. No EN number and no decibel figure are in the captured spec block. The star line is broad, and it still describes one sounder. It is the strongest reviewed combination alarm here for a single room, and a poor substitute for an interlinked kit.
Pros
Cons
Best for: You want the largest review sample on a single smoke-and-CO alarm, and you do not need the house to sound together.
Less suitable: Bedrooms sit behind shut doors, or the home needs interlinked alarms.
Specifications
Common questions
Does the SC07-WX interlink?
The listing says it does not support interconnect and is not compatible with the SBS50.
What CO figure does the app line use?
The listing says you get an app warning when the CO level exceeds 100 ppm.
Which battery is included?
One replaceable CR123A.
The X-Sense XP0A-iR 2-pack is two Wi-Fi smoke and carbon monoxide alarms at £63.74, with 4.4 from 179 amazon.co.uk reviews. The listing names a photoelectric smoke sensor, an electrochemical CO sensor and voice location, and it claims a 10-year service life. It also says the two units are not interlinked and work independently, which reviewers found surprising if they wanted a set to sound together. There is no base station, each alarm joins 2.4 GHz on its own, and the battery is replaceable. One reviewer asked about a subscription that the listing bullets do not explain. No EN 14604 or EN 50291 line is in the captured spec block. A pair at this price does not buy a shared sound, and each unit covers smoke and CO in that room only, not a kitchen heat alarm. Buy it when two separate rooms each need both sensors.
Pros
Cons
Best for: You want smoke and CO cover in two separate rooms, and you accept that they will not sound together.
Less suitable: You need one alarm to trigger the other, or a heat alarm for the kitchen.
Specifications
Common questions
Do the two alarms sound together?
The listing says they are not interlinked and operate independently.
Does it detect carbon monoxide?
Yes. The listing names a photoelectric smoke sensor and an electrochemical CO sensor.
Is a base station in the box?
No. The listing says the alarm connects to the app over Wi-Fi without a base station.
The X-Sense XS0B-iR is one Wi-Fi smoke alarm at £25.49, with 4.3 from 493 amazon.co.uk reviews, and the listing says it joins the app without a base station. It also says it does not support interconnection and is incompatible with the SBS50, so several units in one app will not sound together. German is the default voice, with English and French listed as selectable, and reviewers describe hours of pairing while it spoke German and flashed blue. The cell is a replaceable CR123A, and captured reviews call it expensive and short-lived, including a battery warning after about four weeks and a cell reported flat within weeks. Night mode and sharing with up to 12 people are listed, and no EN number is in the spec block. It is the best value pick here for one room and a phone alert, once you change the language. It is the wrong alarm if the house needs every sounder to go off together.
Pros
Cons
Best for: You want one room to send a phone alert, and you will set the voice to English before you rely on it.
Less suitable: You need the alarms to sound together, or you wanted a sealed cell and a printed EN number.
Specifications
Common questions
Does it need the SBS50?
No. The listing says it connects without a base station and is incompatible with the SBS50.
Will several of these sound together?
No. The listing says it does not support device interconnection.
Which language does it speak first?
The listing says German is the default, with English and French selectable.
The X-Sense XS0B-MR31 is three voice smoke alarms and an SBS50 at £79.99, with 4.3 from 139 amazon.co.uk reviews. The listing says English voice alerts with up to 17 preset locations, night mode, and wireless interlink through the base station. Reviewers liked the voice and an alarm-drill function, and one used the interlink so a garage alarm could be heard in the house, including where a wired system was not practical. They also say the alarms were not pre-paired, the spoken location list felt short, and you should not drill until the link is proven. The captured spec block does not name EN 14604 or a decibel figure, and the cells are replaceable while a 10-year photoelectric sensor is claimed. At the top of this shelf it buys a spoken room name rather than a printed standard. Skip it if you are choosing on EN 14604 or on the lower price of the FS31 kit.
Pros
Cons
Best for: You want the alarm to speak a preset room name, and the listing’s interlink through an SBS50.
Less suitable: You are choosing on a printed standard, or on the lower kit price of the FS31.
Specifications
Common questions
Does it speak the room name?
The listing says English voice alerts with up to 17 preset locations.
Is a base station included?
Yes. The kit lists one SBS50 base station with three XS0B-MR alarms.
Does the listing name EN 14604?
No standard number is in the captured spec block.
The CNBINGO PG-S11 is a single Smart Life Wi-Fi smoke alarm at £19.99, and the display file has no star rating and no review text. The title claims an optical sensor and EN 14604, the listing claims 85 dB, and the box is described with two replaceable AA batteries plus a magnetic shim and screws. The title also says 10 years while those cells are the replaceable AA type, and interlink is not stated. The captured rank is 183,972 in DIY & Tools and 297 in Smoke Alarms. A claimed standard without a UK review line is not evidence the alarm will detect smoke in your hall. Which? has warned that some unbranded marketplace alarms failed its detection tests. This ASIN is not named in that article, and the caution still applies. It is the cheapest listing here, and it is the one with the least you can check before it is above a stair.
Pros
Cons
Best for: You are price-checking a Smart Life listing, and you will not fit it on review evidence that is not there.
Less suitable: You need interlink, a sealed cell, or a review file you can read.
Specifications
Common questions
Which app is named?
Smart Life, over Wi-Fi.
What batteries are supplied?
Two replaceable AA batteries.
Were reviews captured?
No. The saved listing has no review text and no star line.
The XUK listing is a single 2.4 GHz Wi-Fi smoke alarm at £21.99 that names Tuya and Smart Life. The captured amazon.co.uk file has no star rating and no review text, so there is no UK buyer experience to weigh. It claims 85 dB and both a photoelectric and an ionisation sensor, names an upper temperature of 38 °C, and lists SZ PGST Co., Ltd. as the manufacturer. No EN or BS number appears, the cell type is not stated, and interlink is not stated. Which? has warned that some cheap unbranded marketplace alarms failed its detection tests. This ASIN is not named in that article, and the caution still applies to a listing you cannot check. The dual-sensor sentence is a claim, not a result. At this price the missing standard and the missing reviews are the decision, not a small gap on an otherwise documented alarm.
Pros
Cons
Best for: You are only comparing app names, and you will not fit this until a standard and reviews are on the listing.
Less suitable: You need a stated interlink, a named standard, or any UK review sample.
Specifications
Common questions
Which app does the listing name?
Tuya and Smart Life, on 2.4 GHz Wi-Fi.
Is a product standard printed in the capture?
No EN or BS number was in the captured listing.
Are there UK reviews in the saved listing?
No. The captured file has no star rating and no review count.
Nine amazon.co.uk listings were scored on 19 October 2026 from stars, review count, smart-home fit, and shelf price. This is not a laboratory test. A high star line on 26 reviews, or a large review file on an alarm the listing says will not interconnect, does not win on stars alone. The four weights below are the point maxima in the scoring note, and they sum to 100.
Amazon stars
30%Maximum 30. The amazon.co.uk star rating divided by 5, then times 30, rounded to the nearest whole number. A 4.5 line scores 27. No star line scores 0.
Review sample
25%Maximum 25. 1,000 or more reviews scores 22, 300 or more scores 16, 70 or more scores 10, and under 30 scores 6. No review line scores 0. The listing count is used.
Smart-home fit
30%Maximum 30 for a named sensor, an EN 14604 line, a stated interlink, a stated cell, and a named app action. Wi-Fi is not treated as interlink. A replaceable cell next to a 10-year life line is a deduction. A default voice that is not English is a smaller deduction.
Listing and price
15%Maximum 15. The lowest shelf price with 300 or more reviews scores 15. A three-alarm hub kit under £65 with stated interlink and EN 14604 scores 12. A listing under £22 with no review line scores 4.
Match the architecture before you match the price. A hub kit, a Wi-Fi single, and a thin app listing do different jobs. The nine prices below are the amazon.co.uk shelves on 19 October 2026, from about £19.99 to about £79.99. The sounder in the home is still the safety device. A phone alert does not replace it, and Wi-Fi does not mean the alarms are interlinked.
A smart home smoke alarm is a smoke alarm that can also send a phone alert. The sounder in the home is still the safety device. On amazon.co.uk the usual patterns in this set are a mains base station plus radio-linked battery alarms, a single alarm that joins 2.4 GHz Wi-Fi itself, or a thin Smart Life listing with little review evidence. Quality shows up as a photoelectric sensor, a clear interlink line, a stated battery type, and a product mark such as EN 14604, not as an app logo.
Wi-Fi is the path to the phone. Interlink is whether one alarm makes the others sound. The XS0B-iR, the SC07-WX, and the XP0A-iR 2-pack say they do not interconnect. Several units in one app will not sound together. Scottish guidance says radio interlink does not need Wi-Fi.
2.4 GHz only is normal in this set. The AEGISLINK listing says only 2.4 GHz is supported. A failed join on 5 GHz is a setup failure, not a detection failure. The XS0B-iR also ships with German as the default voice. Set English before you rely on the spoken alert.
Scotland’s owner guidance and the Northern Ireland 2024 regulations want sealed long-life cells, or hard-wiring, for the alarms that meet the standard. A replaceable CR123A or AA cell is a different product. A 10-year sensor line, or a 10-year title next to replaceable cells, is not a 10-year battery.
The first check is an audible alarm on every storey you use, on the ceiling in a hall or landing, before any phone feature. Fire Kills and GOV.UK both point at the sounder in circulation space. An app does not satisfy the duties in England, Scotland, Wales, or Northern Ireland on its own, and the phone will not wake people who cannot hear the sounder.
Scotland’s owner guidance and the Northern Ireland 2024 regulations want sealed long-life cells, or hard-wiring, for the alarms that meet the standard. A replaceable CR123A or AA cell is a different product. The FS31 supplies replaceable CR123A batteries. The CNBINGO title says 10 years beside two replaceable AA cells. The SD11-MR31 highlight says a 10-year life while the batteries are replaceable CR123A cells.
Three typical situations, each with a recommendation from this comparison.
You want three alarms the listing says will sound together, plus a phone path through a base station. The X-Sense FS31 states wireless interlink through the SBS50 and claims EN 14604, at about £63.99. The cells are replaceable CR123A batteries, so it is the wrong pattern if Scottish guidance requires a sealed cell.
You already have alarms you can hear at home, and you want one unit to ping your phone when you are out. The X-Sense XS0B-iR joins 2.4 GHz without a hub, at about £25.49, with 4.3 from 493 reviews. The listing says it does not interlink, and German is the default voice.
You want photoelectric smoke and an electrochemical carbon monoxide sensor in one room, and you do not need the house to sound together. The X-Sense SC07-WX is about £45.99, with 4.4 from 2,304 reviews. The listing says it does not interconnect and is not compatible with the SBS50.
The top pick is the X-Sense FS31, score 76, at about £63.99. The listing says three photoelectric alarms are interlinked through an SBS50 and conform to EN 14604. The cells are replaceable CR123A batteries, and the hub needs mains and 2.4 GHz. The best value is the X-Sense XS0B-iR, score 65, at about £25.49, with 4.3 from 493 reviews. That award is the shelf price and the review file. The listing says this alarm does not interconnect, and German is the default voice. Neither result is a lab test.
X-Sense XS0B-iR
Highest listing-and-price score, on about £25.49 and 493 reviews. The listing says it does not interconnect.
Editorial
Peter F. is the editor for DIY & tools at productscompared.co.uk. Comparisons in this category are checked against amazon.co.uk listings, review evidence and public UK sources.
Guides on what to look for, how to use a product, and common mistakes.
Public UK sources from the research digest, last checked on 19 October 2026. Prices, stars, and review counts are the amazon.co.uk lines captured that day.
This page contains affiliate links to amazon.co.uk with the tag pcuk26-21. If you buy through them, we may earn a commission at no extra cost to you. Prices, stars, and review counts are the UK listing lines from 19 October 2026. We did not run a lab test.
