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Burglar alarm system buying guide

Updated: 20.10.2026

Search results put a £25 motion siren beside an app hub and a certificated installer system. A burglar alarm system buying guide has to start with who is told when the alarm trips. Noise on the premises, a phone alert you answer, a monitoring centre, and a police unique reference number are four different products. The [burglar alarm systems comparison](/hub/burglar-protection/burglar-alarm-systems) ranks twelve self-install kits on amazon.co.uk as they stood on 19 October 2026, from £24.99 to £304.99. None of those listings states EN 50131 Grade 2. Peter F. used those listings and public UK sources, with no lab test.

Search results put a £25 motion siren beside an app hub and a certificated installer system. A burglar alarm system buying guide has to start with who is told when the alarm trips.

Our top picks

X-Sense X-Sense Smart Home Security System AS05

Best overall

X-Sense X-Sense Smart Home Security System AS05
8.1/10about £59.49
View offer
KERUI KERUI Wireless Security Burglar Door Alarm System Kit

Best value

KERUI KERUI Wireless Security Burglar Door Alarm System Kit
8.6/10about £29.99
View offer
Yale Yale HSA Essentials Alarm Kit, 5 piece

Rank 3

Yale Yale HSA Essentials Alarm Kit, 5 piece
9.3/10about £81.88
View offer
On this page
  1. 1.What should happen when the alarm goes off
  2. 2.Siren, contacts, and motion
  3. 3.Power, range, and fees
  4. 4.What to spend on amazon.co.uk

What should happen when the alarm goes off

Decide who is listening before you compare brands. A bells-only kit makes noise where it is fitted. If the building is empty all week and nobody is nearby, that siren rings for an empty street. A self-monitored alarm adds a phone alert you, or someone you have asked, have to notice. A monitoring centre is a paid service. A police unique reference number is tied to an approved installer, and these Amazon boxes do not claim one. If the schedule names NSI or Grade 2, that case belongs on the DIY or professional page.

Siren, contacts, and motion

An external box is there so people outside can hear it. Yale's HSA kit, the Yale IA-320, the Ring Alarm Pack M, and the SimpliSafe seven-piece name an outside sounder or bell box. The X-Sense AS05 and AS08 do not. Printed decibel figures are manufacturer claims. Which? measured alarms it tested at roughly 81–104 dB, which is not a ranking of these ASINs. The Yale HSA listing states 104 dB. A door contact opens when the magnet moves. A PIR also sees pets and sunlight on glass. The CPVAN at £24.99 is one PIR and has no door contact.
X-Sense X-Sense Smart Home Security System AS05

Testsieger

X-Sense X-Sense Smart Home Security System AS05
8.1/10about £59.49
View offer

Power, range, and fees

Battery kits suit a garage with no spare socket. Mains hubs need a BS 1363 socket that already exists. KERUI reviewers still put the siren on a short mains lead. X-Sense has no battery backup in the notes, so a power cut drops the Wi-Fi alerts. Yale HSA states 30 metres in open air, and brick eats that. No monthly fee on a title means no monitoring contract, not that the police are included. The no monthly fee page separates plan locks from siren kits that have nothing to renew.

What to spend on amazon.co.uk

On 19 October 2026 the twelve kits fell into three shelf bands. Entry, about £25 to £33, is noise nearby: the CPVAN, the KERUI, and the TOWODE set on only 25 reviews. Mid, about £56 to £85, is where a keypad appears. The Yale HSA at £81.88 puts an external siren on the box and says no monitoring fee. Upper, about £140 to £305, buys a named app or a camera. The Yale IA-320 has an external siren, and the app is the complaint. The Ring pack says a subscription is required for some in-app arming. The best burglar alarm page attaches a job to a shortlist once the response path is settled.

Common questions

Do I need Grade 2 for a normal home policy?
Only if that policy says so. Trade guides treat BS EN 50131 Grade 2 as the usual domestic grade for a police-response install, fitted under PD 6662 by an NSI or SSAIB firm. Admiral says a discount is possible and not guaranteed. None of the twelve listings states Grade 2.
Does the siren need to be outside?
It needs to be outside if neighbours are part of the plan. An indoor horn can wake you in a bedroom or a flat. It is a poor bet for a street-facing house where you want the sound to carry. In this comparison, Yale HSA, Yale IA-320, Ring Pack M, and the SimpliSafe seven-piece name an external sounder. The X-Sense kits do not. Check the box contents, not a generic wireless alarm photo.
How many door sensors does a small flat need?
Start with the door you use every day, then any other opening a person can reach without a ladder. One contact is a starter. Two contacts, as on the X-Sense AS05, cover a front door and one more leaf, not every window. Add a PIR only for a room you can keep clear of pets and heaters. If you cannot buy extra contacts from the same range, the starter set is the whole system.
Will it work if the Wi-Fi drops?
A battery siren with a remote still makes noise if the router dies, because it was never using Wi-Fi. An app alert on a Wi-Fi-only hub stops when broadband stops, unless the listing has a real cellular backup and you are paying for it. The X-Sense notes have no battery backup, so a power cut drops the alerts as well. Read the power line before you rely on the phone.
Are the decibel numbers on Amazon a test?
No. They are the manufacturer's figure on the listing, or sometimes only a bullet. Which? measured other alarms at roughly 81–104 dB in its own tests. That is not a measurement of these twelve ASINs. Use the number to see whether the brand stated one at all. The Yale IA-320 specification states a range and does not state a decibel figure.
Is a £30 kit a false economy for a house that is empty all week?
It is the wrong tool if nobody is there to hear it and the kit cannot call a phone. A KERUI or CPVAN in a shed next to the house can still be the right noise. The same money on a house that sits empty is a siren for an empty room. You would be paying for a response path the box does not have, however many stars the listing shows.

Related pages

How to set up a burglar alarm system

Burglar alarm systems

Best burglar alarm system for a small UK home

DIY burglar alarm or a professional install in the UK

Burglar alarm with no monthly fee for UK homes

Sources

Public UK sources from the research digest, checked for this page on 20 October 2026. Listing prices, stars, and review counts are amazon.co.uk figures from 19 October 2026.

  1. NPCC security systems policy, March 2024 (retrieved 19 October 2026)
  2. NPSA home security systems (retrieved 19 October 2026)
  3. Which? burglar alarms and smart security systems (retrieved 19 October 2026)
  4. SimpliSafe UK plan options, 29 June 2026 (retrieved 19 October 2026)
  5. Harbro, wireless alarms and grades (retrieved 19 October 2026)
  6. DC Fire & Security, wireless burglar alarms (retrieved 19 October 2026)
  7. Ring UK, which alarm plan (retrieved 19 October 2026)
  8. amazon.co.uk listings for the twelve ASINs in this comparison (retrieved 19 October 2026)