How to set up a WiFi smoke alarm
Updated: October 2026
The box is open, the phone is on the fast network, and the alarm is about to go on the ceiling before anyone has heard it from the bedroom. How to set up a WiFi smoke alarm, on these amazon.co.uk kits, is shorter if you pair it while you can still hold it. Peter F. used the listings from 19 October 2026 and the SBS50 manual for the hub path, and did not rank the alarms or run a lab test. A qualifying purchase can earn a commission at no extra cost to you. Which box you bought is on the [smart home smoke alarm comparison](/hub/fire-protection/smart-home-smoke-alarm).
The box is open, the phone is on the fast network, and the alarm is about to go on the ceiling before anyone has heard it from the bedroom.
The box is open, the phone is on the fast network, and the alarm is about to go on the ceiling before anyone has heard it from the bedroom. How to set up a WiFi smoke alarm, on these amazon.co.uk kits, is shorter if you pair it while you can still hold it. Peter F. used the listings from 19 October 2026 and the SBS50 manual for the hub path, and did not rank the alarms or run a lab test. A qualifying purchase can earn a commission at no extra cost to you. Which box you bought is on the smart home smoke alarm comparison.
Our top picks
| Badge | Product | Connection | App | Interlink | Note | Price | Offer |
|---|---|---|---|---|---|---|---|
| Best overall |  AEGISLINK AEGISLINK Smart Smoke Alarm with Magnetic Mount, ASW-MR31 | 2.4 GHz Wi-Fi with its own base station | Own app; sharing, drills, history | Not stated | 5.6 | about £77.99 | View offer |
 X-Sense X-Sense Wi-Fi Smoke Alarms with SBS50 Base Station, FS31 | 2.4 GHz Wi-Fi via SBS50 base station | X-Sense Home Security; test, silence, share | Yes, wireless, with the base station | 7.6 | about £63.99 | View offer | |
| Best value |  X-Sense X-Sense Wi-Fi Smoke Alarm with Voice Alerts, XS0B-iR | Wi-Fi direct, 2.4 GHz | X-Sense Home Security; share up to 12 | No | 6.5 | about £25.49 | View offer |
On this page
Get onto 2.4 GHz before you climb
These alarms join 2.4 GHz, not 5 GHz. One Wi-Fi name for both bands often leaves the phone on 5 GHz, so the alarm never appears. The SBS50 manual says the hub is incompatible with 5 GHz. Pair near the router with Bluetooth on.
For an SBS50 kit, power the base station, scan the QR code in the X-Sense Home Security app, hold Pair for about five seconds until the LED flashes yellow, and enter the 2.4 GHz password. Success is a solid blue light. Solid yellow means it failed. Smart Life listings and the AEGISLINK do not use those steps. What the app does not replace is on the buying guide.
Fit it on the ceiling, then listen from the bedroom
Fit it on the ceiling in the hall or landing, at least one on every level, about 30 cm clear of walls and lights. Not in the kitchen or bathroom. London Fire Brigade wants a heat alarm in the kitchen, and none of these nine is that.
Screw the bracket. Do not glue. Use a magnetic pad only if that listing includes one and the ceiling suits it. Prove the link before the holes are final. Listen from the bedroom with the door shut. A green light in the app has not told you the room can hear it.
Press the button until it sounds
Press and hold the button until the alarm sounds, and listen where people sleep. Tenants are told to test at least monthly. Which? says weekly for owners. An app test on the FS31 counts only if you hear it. On a kit that claims interlink, the other alarms should sound too. The XS0B-iR, SC07-WX and XP0A-iR will not trigger each other. If the XS0B-iR speaks German, set English while it is still in your hand. A real fire is 999, not a hush from the app.
If it still will not join
A wrong password fails like the wrong band: solid yellow on the SBS50, or a single that never leaves pairing. Bluetooth off blocks the hub before the password matters. Split a combined Wi-Fi name only by your router’s own guide.
If the hall sounds and the phone stays quiet, allow notifications for the app and test again. Do not glue the disc up. The hub adapter is not a cue to wire alarms into the lighting circuit. Mains work, including a rented storey in Wales, belongs to an electrician. If broadband later dies, the limit is on the when you are away page.
Common questions
How do I set up a Wi-Fi smoke alarm?
Pair it on 2.4 GHz while it is still in your hand, screw it to the ceiling in the hall or landing, then press the button until you hear it from the bedroom with the door shut. Hub kits that include an SBS50 join the X-Sense Home Security app from the base station first. Alarms with no hub join the app themselves. Smart Life listings do not use the SBS50 steps.
Why will it not join my 5 GHz network?
Because these alarms and the SBS50 are built for 2.4 GHz, and the SBS50 manual says the hub is incompatible with 5 GHz. The sensor has not failed. Put the phone on the 2.4 GHz name, or split the names using your router’s own instructions, and pair again near the router with Bluetooth on.
Do I pair the base station before I climb the ladder?
Yes, if the box contains an SBS50. Power the hub, scan the QR code, hold Pair for about five seconds, and wait for the solid blue light and the spoken connection before you commit to screw holes. The XS0B-iR, SC07-WX and XP0A-iR have no base station. Do not follow the SBS50 steps for those, or for a Smart Life alarm.
Where should the alarm go?
On the ceiling in the hall or landing, about 30 cm clear of walls, lights and vents, and not in the kitchen or bathroom. You should hear it with the bedroom door closed. A kitchen needs a heat alarm, which is not one of these smoke listings. Screw it. Use a magnetic pad only if that listing includes one and the ceiling suits it.
How do I know the test worked?
You heard the sounder. Hold the button until it sounds, which Fire Kills describes, and listen from the bedroom. On an interlinked kit, the other alarms should sound too. A green online dot, a solid blue hub light, or a successful password are earlier steps. They are not the test. Tenants are told to do this at least monthly. Which? says weekly for owners.
What do I change if the voice comes out in German?
On the XS0B-iR, German is the listed default, and English is selectable in the app. Change it before the alarm is above the stair. The voice kits that ship as the XS0B-MR31 are listed with English voice alerts, so do not assume every X-Sense box starts in German. If it will not pair at all, fix 2.4 GHz and Bluetooth before you blame the language setting.
Related pages
Sources
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.
- GOV.UK — Smoke and Carbon Monoxide Alarm (England) Regulations, landlord booklet (retrieved 19 October 2026)
- legislation.gov.uk — England, smoke and carbon monoxide alarms, regulation 4 (retrieved 19 October 2026)
- Scottish Government — fire and smoke alarms in Scottish homes (retrieved 19 October 2026)
- Scottish Fire and Rescue Service — smoke and heat alarms (retrieved 19 October 2026)
- legislation.gov.uk — Wales, fitness for human habitation, regulation 5 (retrieved 19 October 2026)
- legislation.gov.uk — Northern Ireland private tenancies, 2024 (retrieved 19 October 2026)
- London Fire Brigade — smoke alarms and heat alarms (retrieved 19 October 2026)
- Which? — how to buy the best smoke alarms, 12 May 2026 (retrieved 19 October 2026)