A visible sign, without monitoring
You will not pay for a monitored system, and you can drill a wall or will ask someone who can. The Yale AC-DBX is the white flashing box with two AA cells in the pack and an IPX5 claim. It does not detect or sound.
Dummy alarm system comparison 2026
The best Dummy alarm systems, compared.
Top pick: Yale AC-DBX dummy siren – Highest score, 91, for a Yale-shaped flashing box with cells in the pack and an IPX5 claim. It does not sound. Best value: QUANAN blue dummy alarm box – Lowest snapshot price, about £19.99, and the largest sample, 4.4 from 581 reviews, if you accept the seal and battery-life complaints. Updated 20.10.2026.
Charlie White (Charlie DIYte)Expert source
A dummy alarm system is a plastic bell box that copies a working intruder alarm and does not detect anyone. Yale's page for the says the box is not linked to a system and does not sound or trigger. The other boxes here are a flashing LED shell or an empty decoy on a house, garage, or shed. A kit that can sound belongs in the [alarm systems comparison](/hub/burglar-protection/alarm-systems). The differences that matter are the housing, an LED that matches the listing, a battery claim reviews do not contradict, and an IP code rather than the word weatherproof. PD 6662 and BS EN 50131-1 apply to real systems, not to a silent lookalike. The [dummy alarm system buying guide](/hub/burglar-protection/dummy-alarm-system/sub/dummy-alarm-system-buying-guide) is the checklist for dummy or real, LED or shell, IP, batteries, and the sticker. Shoppers buy one as a cheap visible sign on a house, garage, or shed. None of the six has a sensor loop.
A dummy alarm system is a plastic bell box that copies a working intruder alarm and does not detect anyone. Yale's page for the says the box is not linked to a system and does not sound or trigger.
22 products checked · 58 hrs invested · +21,400 readers
6 of 6: Best Dummy alarm systems compared
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1-2 of 6Best overall
Best value
9.1/10
8.6/10
7.0/10
8.2/10
7.4/10
6.8/10
∼ £22
∼ £23
∼ £22
∼ £20
∼ £25
∼ £22
4.6(436)
4.6(160)
4.5(13)
4.4(581)
4.4(15)
4.3(200)
Personal buying guide
Which dummy alarm system fits?
Question 1 of 2
Do you want a light at night?
The best Dummy alarm systems in detail
Our view
The Yale AC-DBX is a white dummy siren, about 25.9 × 25.9 × 6.1 cm and 500 g, with a flashing LED that runs on two AA cells supplied in the box. Across 436 amazon.co.uk reviews it averages 4.6, and the listing allows the outside of the home plus a garage, shed, or outhouse, with screws included. Yale's own UK page says the box is not linked to a system and does not sound or trigger, so the LED is the whole performance. The bullets claim up to three years from those cells and an IPX5 water-jet rating, with the solid-object digit left unstated. Reviewers who already know a live Yale sounder describe the flash as slower and dimmer. The Amazon table also prints 100 dB, a motion sensor, and app control, which conflicts with the dummy description and is not a sound output. The comparison snapshot is £22.03; on 19 October 2026 amazon.co.uk showed about £29 and the Yale shop £31.99.
Pros
- Flashing LED with 2 AA cells included and screws in the pack
- IPX5 water-jet claim, for the house or an outbuilding
- Yale external shape, 4.6 from 436 reviews
- Maker's page states it does not sound or trigger
Cons
- Does not detect, sound, or notify anyone
- Amazon table claims 100 dB, a motion sensor, and app control
- Flash described as slower and dimmer than a working Yale sounder
- Shelf price had moved above the £22.03 snapshot by 19 October 2026
Best for: A second wall that should match a Yale external siren, with cells already in the pack.
Less suitable: Anyone who needs a noise, a phone alert, or an insurer's alarm certificate.
Specifications
- Model
- Yale AC-DBX dummy siren
- Brand
- Yale
- Price
- ∼£22
- Customer rating
- 4.6/5(436)
- Flashing light
- Yes
- Sounder
- No
- Weather claim
- IPX5
- Cells
- 2 AA
- Batteries included
- Yes
- Power
- Battery
- Fixings
- Screws included
- Outdoor use
- Yes
- Housing colour
- White
- Dimensions
- 25.9 × 25.9 × 6.1 cm
- Weight
- 500 g
Common questions
Does the Yale AC-DBX make a noise?
The listing sells it as a dummy siren and a visual deterrent with a flashing LED. It does not describe a sounder. The Amazon table also prints 100 dB, which conflicts with that description.
Are batteries included?
Yes. The bullets say 2 AA batteries are included and claim a life of up to 3 years.
Can you fit it on a shed?
The bullets say it can go on the outside of the home and on outbuildings, including a garage, shed, or outhouse. Fixings are included. It is a wall mount, not a tool-free stick-on.
Our view
The Nedis DUMSS20WT is a white and orange PVC dummy, 9 × 19 × 27 cm and 510 g, with a red flashing LED and a listing that says it emits no sound. Across 160 amazon.co.uk reviews it averages 4.6, at a snapshot price of £22.74. The bullets claim IP44, which is splash and limited dust protection rather than water jets, and the pack includes an alarm sticker plus mounting hardware. It needs three AA cells at 4.5 V, and those cells are not included. The written UK comments behind that star line are only a short run of positive notes, so the 4.6 is a thinner set of words than the Yale sample. The Amazon table prints 1 dB and a contact sensor, which conflicts with the no-sound bullets. It is a clear decoy if you read the description, and a confusing one if you shop from the table.
Pros
- Bullets state no sound and a red flashing LED
- IP44 splash claim on a PVC housing
- Alarm sticker and mounting hardware included
- 4.6 from 160 reviews
Cons
- 3 AA cells are not included
- IP44 is splash protection, not a jet rating
- Amazon table lists 1 dB and a contact sensor
- Few written UK comments behind the star line
Best for: A silent box with a stated splash rating, a sticker, and fixings, if you will buy the cells.
Less suitable: A wall that takes water jets, or a shopper who wants batteries in the pack on day one.
Specifications
- Model
- Nedis DUMSS20WT dummy siren
- Brand
- Nedis
- Price
- ∼£23
- Customer rating
- 4.6/5(160)
- Flashing light
- Yes, red LED
- Sounder
- No
- Weather claim
- IP44
- Cells
- 3 AA
- Batteries included
- No
- Power
- Battery
- Fixings
- Hardware included
- Outdoor use
- Yes
- Housing colour
- White and orange
- Dimensions
- 9 × 19 × 27 cm
- Weight
- 510 g
Common questions
Does the Nedis dummy siren make a noise?
No. The bullets say it mimics a real system without emitting any sound. The Amazon table lists 1 dB, which conflicts with that sentence.
What is the weather rating?
The bullets say IP44, a white and orange PVC housing protected against splashes and dust. Batteries are 3 AA and are not included.
Is a sticker included?
Yes. Included components are an alarm sticker, the dummy siren, and a manual, and the bullets add mounting hardware.
Our view
The SD Fire Alarms WFP-REC-BOX is a white dummy bellbox with a blue lens, at £21.98, and the listing stops there. Across 13 amazon.co.uk reviews it averages 4.5, which is too small a sample to treat as a settled view of the product. The file does not state an LED, a battery, an IP rating, dimensions, weight, fixings, or outdoor use. A blue lens is not, on this page, a promise of a flash you can see from the street after dark. It can still be a plain shape on a wall if that is the job you named, and you cannot check a weather claim because none is written down. At this price it sits next to boxes that do state a light, a cell count, and a way to fix them.
Pros
- White body and blue lens in a familiar bellbox outline
- Sold explicitly as a dummy bellbox
- 4.5 from the 13 reviews on the listing
Cons
- Only 13 reviews
- Light, batteries, IP rating, size, and fixings are not stated
- No way to confirm a flash or outdoor use from the listing
Best for: A plain shell when you accept that a light and a weather rating are not described.
Less suitable: Anyone who needs a flashing LED, a stated IP code, or a large review sample.
Specifications
- Model
- SD rectangle dummy bellbox
- Brand
- SD Fire Alarms
- Price
- ∼£22
- Customer rating
- 4.5/5(13)
- Sounder
- Not stated
- Housing colour
- White, blue lens
Common questions
Does this rectangle box flash?
The listing does not say. The only features given are a white body, a blue lens, and that it is a dummy bellbox.
What batteries does it use?
Not stated. Power, cell count, and whether batteries are included are all missing from the listing.
Is it for outdoor use?
The file does not say. There is no IP rating, weight, or dimension line.
Our view
The QUANAN AE-BX01 is a blue ABS dummy bell box, listed at 240 × 150 × 60 mm and 600 g, with a flashing LED that needs three AA cells at 4.5 V. Across 581 amazon.co.uk reviews it averages 4.4, the largest sample in this set, and the snapshot price is £19.99. Buyers often describe a straightforward screw-on sign, and the pack includes fixings. Whether the cells are in the box is not stated, and a review says the instructions mention four cells while the holder takes three. The bullets say fully weatherproof, but there is no IP code, and a UK review describes sealing the top and sides after water got in. Another review on this ASIN reported the light lasting about three weeks, so the low price does not mean you can ignore the cover. The Amazon table lists a motion sensor, which the dummy bullets do not support.
Pros
- Lowest snapshot price in the set at £19.99
- 4.4 from 581 reviews, the largest sample here
- Flashing LED in a 240 × 150 × 60 mm ABS box
- Fixings included
Cons
- No IP code, and a UK review disputes the weatherproof line
- Instructions and the holder disagree on three versus four cells
- A review reported about three weeks of light
- Amazon table lists a motion sensor the bullets do not describe
Best for: A low spend on a flashing blue box, if you will check the seals and replace AA cells.
Less suitable: An exposed wall in driving rain, or anyone who wants a stated IP code and cells in the pack.
Specifications
- Model
- QUANAN blue dummy alarm box
- Brand
- QUANAN
- Price
- ∼£20
- Customer rating
- 4.4/5(581)
- Flashing light
- Yes
- Sounder
- Not stated
- Weather claim
- No IP code
- Cells
- 3 AA
- Power
- Battery
- Fixings
- Included
- Outdoor use
- Not stated
- Housing colour
- Blue
- Dimensions
- 24 × 15 × 6 cm
- Weight
- 600 g
Common questions
How many batteries does it take?
The specification says 3 AA batteries at 4.5 V. Whether they are in the box is not stated. A review says the instructions mentioned four cells while the holder takes three.
Is it weatherproof?
The bullets say fully weatherproof. A UK review says it is not, and describes sealing the top and sides. There is no IP code on the listing.
Does it detect movement?
The bullets describe a dummy bell box with an LED. The Amazon table lists a motion sensor. Those two lines conflict. Treat the table row as unverified.
Our view
The SD Fire Alarms WFP-DEC-BOX is a decagon decoy that states no sounder and no light, at £24.99, the highest snapshot price in this set. Across 15 amazon.co.uk reviews it averages 4.4. A UK review agrees there is no internal LED and says a separate LED could be added, which would be a modification, not a feature in the box. The bullets include a red or blue attachment, so you are choosing a colour of trim rather than a flasher programme. Dimensions, weight, an IP rating, and fixings are not stated. It is the empty shell if you do not want a battery to maintain, and it costs more than the flashing boxes that do state an LED. With only 15 reviews, a quiet listing is not the same as a proven one.
Pros
- Listing states no sounder and no light
- Red or blue attachment included
- No cells to replace if you leave the box dark
Cons
- Only 15 reviews
- Highest snapshot price at £24.99, with size, IP rating, and fixings unstated
- A review notes you would have to add an LED yourself
Best for: A visible shell with no LED to keep alive, if the higher price is acceptable.
Less suitable: A reader who wants a flash at night, a stated weather rating, or the lowest price.
Specifications
- Model
- SD decagon dummy bellbox
- Brand
- SD Fire Alarms
- Price
- ∼£25
- Customer rating
- 4.4/5(15)
- Flashing light
- No
- Sounder
- No
- Housing colour
- Red or blue trim
Common questions
Does the decagon box flash?
No. The bullets say it is a decoy with no sounder or light. A UK review agrees there is no internal LED and says a separate LED could be added.
Does it make a noise?
No. The listing says there is no sounder.
What colour does it come in?
The bullets say it comes with a red or blue attachment. Dimensions, weight, and an IP rating are not stated.
Our view
The Maclean DC3300 is sold as a white and red solar dummy, with a bullet size of 280 × 200 × 95 mm and a weight of 310 g, at £21.66. Across 200 amazon.co.uk reviews it averages 4.3. The bullets say three LEDs and four AA cells, not included, and they allow indoor or outdoor use without an IP code. UK reviews on this ASIN say the unit has one LED and a holder for three AA cells, so the parcel and the bullets are not the same count. The Amazon table also lists 50 dB, a PIR sensor, a remote, 12 V, and freestanding, which conflicts with a dummy title. One review mentions a small solar panel keeping the cells charged, which is a charger for small cells, not a measured winter runtime. It is a possible solar lid only after you have opened that conflict, not the default box in this set.
Pros
- Sold as a solar dummy rather than cells alone
- 310 g, lighter than the Yale and Nedis boxes
- 4.3 from 200 reviews
- No mains lead is listed
Cons
- UK reviews report one LED and three cells, not three LEDs and four AA
- Batteries not included, and no IP code
- Amazon table claims 50 dB, a PIR, a remote, and 12 V
- No measured runtime through a UK winter
Best for: A solar lid only after you have checked the LED and cell counts against the bullets.
Less suitable: Anyone buying from the bullet count alone, or a lid that sits in shade all winter.
Specifications
- Model
- Maclean DC3300 solar dummy
- Brand
- Maclean
- Price
- ∼£22
- Customer rating
- 4.3/5(200)
- Flashing light
- 3 claimed, reviews say 1
- Sounder
- Not stated
- Cells
- 4 AA, reviews say 3
- Batteries included
- No
- Power
- Solar and battery
- Outdoor use
- Yes
- Housing colour
- White and red
- Weight
- 310 g
Common questions
Is the Maclean DC3300 a real siren?
The title calls it a dummy burglar deterrent and fake security, and the item type is Solar Dummy Alarm Siren. The Amazon table also lists 50 dB, a PIR sensor, and a remote. Those rows conflict with the title.
How many LEDs and batteries does it have?
The bullets say 3 LEDs and 4 AA batteries, not included. UK reviews say the unit has one LED and a holder for three AA cells.
Does it need to be plugged in?
No mains lead is listed. Power is given as battery, and the item type says solar. One UK review mentions a small solar panel keeping the cells charged. There is no IP code in the file.
How we compared
Six amazon.co.uk listings were scored on 19 October 2026. Prices, star lines, and review themes come from those files. This is not a laboratory test. A dummy is a silent external box. Decibel rows, PIR lines, and app lines on a dummy title are conflicts, not performance. The four weights below sum to 100. Very few reviews, a weatherproof line with no IP code, and LED or cell counts that UK reviews contradict were applied as deductions.
1
Amazon stars and review count
40%Maximum 40. A large sample outweighs a tiny one at a similar star line. The SD shells, with 13 and 15 reviews, lose marks here.
2
Fit for a visible decoy
30%Maximum 30. An LED that matches the listing, a battery story, a stated IP code, and fixings or a sticker. A table row that claims sound, a sensor, or an app on a dummy does not score as a feature.
3
Price against that job
20%Maximum 20, in GBP, using the comparison snapshot. The Yale £22.03 figure is a snapshot. On 19 October 2026 amazon.co.uk showed about £29.
4
Review themes and listing conflicts
10%Maximum 10, applied as deductions. "Up to 3 years" stays a claim, not a measured life. "Fully weatherproof" with no IP code is a deduction.
Independent review
Last updated: 20.10.2026
8 sources checked
Dummy alarm system buying guide
A dummy alarm system is a visible box, not a detector. The six prices below are amazon.co.uk snapshots, from about £19.99 to £24.99, checked on 19 October 2026. Match the job first: a flashing LED, an empty shell, or a solar lid whose LED count UK reviews dispute. Then read the IP line, the cell count, and whether the Amazon table claims a siren the title does not. A sounding kit is a different category.
What is a dummy alarm system?
A dummy alarm system on amazon.co.uk is a plastic external bell box that copies a working intruder alarm and does not detect anyone. Yale's page for the AC-DBX says the box is not linked to a system and does not sound or trigger. The other boxes in this set are either a flashing LED shell or an empty decoy. Shoppers buy one as a cheap visible sign on a house, garage, or shed. None of the six has a sensor loop.
Best for
- Householders who want a visible sign and will not pay for monitoring
- Owners of a Yale-style siren who want a matching shape that will not sound
- A low spend on a flashing box if you will check seals and replace AA cells
Not ideal for
- Anyone who needs a noise, a phone alert, or an insurer's alarm certificate
- A policy that requires a monitored system or a police unique reference number
- A reader who treats an Amazon decibel row on a dummy title as sound output
Mistakes to avoid
- 1
Buying a sensor kit from a dummy search
A kit with sensors, a keypad, and a siren that can sound is a real alarm. It was removed from this set. A dummy does not detect anyone and does not notify you.
- 2
Quoting the Amazon decibel row
Yale's UK page says the AC-DBX does not sound. The Amazon table still prints 100 dB. Nedis bullets say no sound while the table prints 1 dB. Those rows are conflicts, not siren output.
- 3
Trusting "up to 3 years" or a monitored sticker
"Up to 3 years" is a listing claim. A UK review on the blue box reported about three weeks. Do not hide the box, and do not name a monitoring company unless that service exists.
What to weigh up
Confirm it is a dummy
HighThe first check is whether the box can detect or sound. A dummy on these listings is a plastic external bell box. Yale's page for the AC-DBX says it is not linked to a system and does not sound or trigger. Nedis bullets say the DUMSS20WT emits no sound. The SD decagon states no sounder and no light. A kit with sensors, a keypad, and a siren that can sound was removed from this set. Split what is left into a flashing LED or no light.
Cells, LED count, and weather
HighBatteries and weather are the next checks, and the listings do not agree. Yale's listing says 2 AA included and claims up to 3 years. That life is a claim, not a measured result. Nedis wants 3 AA, not included. The blue AE-BX01 wants 3 AA. Whether those cells are in the box is not stated, and a review says the instructions mention four cells while the holder takes three. A UK review on that ASIN reported about three weeks of light. The Maclean listing says 4 AA, not included.
Which option suits you?
Three typical situations, each with a recommendation from this comparison.
A second wall that should match a Yale siren
You already know a live Yale external sounder and want a matching shape that will not sound. Reviewers describe the AC-DBX flash as slower and dimmer than that working box. The maker's page states it does not sound or trigger.
The lowest snapshot price
You want a flashing blue box at about £19.99 and you will check the seals and replace AA cells. The QUANAN AE-BX01 has 4.4 from 581 reviews. There is no IP code, and a UK review reported about three weeks of light.
Common questions about Dummy alarm systems
Which dummy alarm system is the top pick?
The top pick is the Yale AC-DBX, score 91, at a snapshot of about £22.03. It is a white flashing box with two AA cells in the pack, screws, and an IPX5 claim, and 4.6 from 436 amazon.co.uk reviews. Yale's UK page says it does not sound or trigger. On 19 October 2026 amazon.co.uk showed about £29, so treat £22.03 as a snapshot. The table's 100 dB row is a conflict, not sound output.
Which listing is the best value?
The best value is the blue QUANAN AE-BX01 at about £19.99, score 82. It has a flashing LED, fixings, and 4.4 from 581 reviews, the largest sample here. There is no IP code. A UK review disputes the weatherproof line and describes sealing the top and sides. Another review reported about three weeks of light. The instructions and the holder disagree on three versus four AA cells. The badge holds only if you accept those limits.
How much does a dummy alarm system cost?
The six amazon.co.uk snapshots sit between about £19.99 and £24.99: blue box £19.99, Maclean £21.66, SD rectangle £21.98, Yale snapshot £22.03, Nedis £22.74, and SD decagon £24.99. On 19 October 2026 amazon.co.uk showed the Yale at about £29 and the Yale shop at £31.99. A trade LED decoy such as a Morse box at £59 is the same idea at a higher parts price. Prices move.
What should I check before I buy?
Confirm the title is a dummy. A kit with sensors, a keypad, and a siren that can sound is a different product. Split a flashing LED from a shell with no light, and ignore a table row that prints decibels, PIR, or an app. Check the cell count against UK reviews, and prefer a stated IP code over the word weatherproof. Yale claims IPX5 and Nedis claims IP44. The blue box and both SD shells state no IP code.
Does a dummy alarm change home insurance?
MoneySuperMarket says a dummy does not influence home-insurance cost. Aviva says professional burglars may spot a fake. These boxes are not certified to BS EN 50131 and are not eligible for a police unique reference number. Telling an insurer you have an alarm when you only have a dummy puts a claim at risk. The dummy versus a real alarm covers standards and insurance, not this price grid.
Does the Yale AC-DBX make a noise?
No. Yale's UK page for the AC-DBX says the box is not linked to a system and does not sound or trigger. The amazon.co.uk listing sells it as a dummy siren with a flashing LED. The same table prints 100 dB, a motion sensor, and app control. Those rows conflict with the dummy description. Nedis bullets also say no sound, while that table prints 1 dB. Do not treat either row as a siren.
When should I call a professional?
Call an NSI or SSAIB company when you need a sounder, notification, or a certificate the insurer named. A police unique reference number needs a qualifying monitored system, not a silent box. Do not work at a ladder height you cannot manage, and do not feed a battery dummy from the mains with a random adaptor. If the policy requires an alarm, ask the insurer first.
Our verdict
The top pick is the Yale AC-DBX, score 91. It is a Yale-shaped flashing box with two AA cells in the pack and an IPX5 claim, and 4.6 from 436 reviews. Yale's UK page says it does not sound or trigger. The Amazon table's 100 dB, sensor, and app rows, and a shelf price that had moved above the £22.03 snapshot, keep it from a higher mark. The best value is the blue QUANAN AE-BX01, score 82, at about £19.99, with 4.4 from 581 reviews. That badge holds only if you accept the seal and battery-life complaints. Neither score is a lab test, and neither box is an alarm an insurer will treat as a system.
Best overallView offer
Yale AC-DBX dummy siren
Highest score, 91, for a Yale-shaped flashing box with cells in the pack and an IPX5 claim. It does not sound.
Best value
View offer
QUANAN blue dummy alarm box
Lowest snapshot price, about £19.99, and the largest sample, 4.4 from 581 reviews, if you accept the seal and battery-life complaints.
Editorial
DIY & tools editor
Burglar protectionDummy alarm systemsamazon.co.uk listings
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.
Updated: 20.10.2026
8 sources checked
Guides to Dummy alarm systems
Guides on what to look for, how to use a product, and common mistakes.
Best dummy alarm systemWhich kept box fits which job, and who should skip a decoy.Dummy alarm system buying guideDummy or real, LED or shell, IP, batteries, and the sticker.How to fit a dummy alarm systemWhere and how to screw one box to an outside wall.Solar or battery dummy alarmA battery LED against a solar lid, and why the light dies.Dummy alarm system vs real alarmA silent decoy against a system that can sound or satisfy an insurer.
Related comparisons
Sources
Public UK sources from the research digest. Listing prices, stars, and review counts are from amazon.co.uk on 19 October 2026.
- Yale AC-DBX dummy siren (retrieved 19 October 2026)
- Consumer Rights Act 2015, section 11 (retrieved 19 October 2026)
- NSI on PD 6662:2017 for intruder and hold-up alarms (retrieved 19 October 2026)
- NSI, intruder alarm systems (retrieved 19 October 2026)
- Redditch Borough Council home security guide, August 2021 (retrieved 19 October 2026)
- CSA Group, ingress protection (IP) testing (retrieved 19 October 2026)
- MoneySuperMarket, burglar alarms and home insurance (retrieved 19 October 2026)
- Aviva, which alarm system for your home (retrieved 19 October 2026)
Expert source (DIY & tools): Charlie White (Charlie DIYte) (external profile) – public expert commentary used as a research source, not as a contributor to our pages.
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 used on 19 October 2026. We did not run a lab test.