The best alarm door stops, compared.
Top pick: Miangerrn door stop alarm Best value: KERUI door stop, 2-pack – Best price among wedges with their own review text, a stated gap of at least 8–10 mm, and no heat report. The cheaper KERUI single is blocked by a heat report. Updated October 2026.
An alarm door stop is a plastic wedge you set on the floor inside a door that opens towards you. A push meets the base and, if the plate or roller switches, a siren sounds. Shoppers on amazon.co.uk use them for hotel rooms, spare bedrooms, and nights alone. The cheaper single is not that pick: one review describes heat and a burning smell once the 9V was fitted. A 120, 125, or 130 dB line is a listing claim, not a measured peak. If the cylinder is the weak point, use a [door lock comparison](/hub/door-and-window-security/door-lock). Do not wedge a fire door, and keep a clear way out. A push both resists the door a little and sets off a siren. They are a noise if the door moves. They are not a lock, and they are not a legal way to hold a fire door open.
An alarm door stop is a plastic wedge you set on the floor inside a door that opens towards you. A push meets the base and, if the plate or roller switches, a siren sounds.
28 products checked · 61 hrs invested · +17,300 readers
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Personal buying guide
Question 1 of 2
How many doors do you want to cover?
The Miangerrn Y-104 is about £12.90, white, 12 x 5 x 3 cm, 98 g, plastic and rubber, with a silicone hanging loop. The bullets claim a loud siren without a decibel number, grip on carpet, tile, wood, and laminate, and a plain rubber wedge when the alarm is off. They do not state the cell type or the gap. The only United Kingdom review says two AAA batteries were in the box, the switch moves from off to one of two volume levels, the unit beeps to set and then stays quiet, and the lower volume was already very loud. The reviewer bought it after a hotel issued the wrong key to an occupied room and wanted it for later trips. A 5.0 from one rating cannot show how often that battery inclusion or that grip claim holds. Warranty is not stated. Best Sellers Rank is 1,360 in Door Stops.
Pros
Cons
Best for: Someone who wants a loop and cells in the box, and who will judge it on one night's test rather than on stars.
Less suitable: Anyone treating 5.0 as a reliability record.
Specifications
Common questions
How loud is it, according to the listing?
The bullets say a loud siren and do not give a decibel figure. The only review says the lower of two volume levels was already very loud.
Were batteries in the box?
The single United Kingdom review says the box included two AAA batteries. The bullets do not name the cell type.
How many ratings support the 5.0?
The listing line is 5.0 from one rating, and the file contains that one review. It is not a sample.
The TECKNET TK-HA003 is about £13.99 with 4.4 from 557 ratings and 49 captured United Kingdom reviews, an own pool. Bullets claim vibration plus motion, up to 130 dB, a red light, a USB-C lithium cell charged in about one hour for up to three months, a low-battery alert of three beeps and three flashes, a sensitivity roller, a silicone base for tile, wood, and carpet, and a 36-month warranty if you register. The bullet weight is 42 g. The item-weight line is 110 g. Dimensions are 10 x 4 x 3 cm. No gap in millimetres is stated. Reviews are mostly about how loud it is and about hotel, Airbnb, and Travelodge use. Several say you must charge it before you go, and that charging took around two hours or a few hours rather than one. One cable was called too short. One unit sounded when tapped but did not sound on several doors and floors. A reviewer price of £12.99 differs from the £13.99 shelf line.
Pros
Cons
Best for: A regular traveller who will charge it at home and wants one small wedge without a PP3.
Less suitable: A door you leave ajar, or a night when the cell is flat and you have no cable.
Specifications
Common questions
How is it powered?
A built-in rechargeable lithium cell, charged by USB-C. The bullet says about one hour and up to three months. Reviewers report about two hours or a few hours. A cable is included; one reviewer called it very short.
What do the weight lines say?
The bullet says 42 g. The item-weight line says 110 g. Dimensions on the page are 10 x 4 x 3 cm. No gap in millimetres is stated.
Is there a warranty on the listing?
Yes. The bullet says 36 months, registered only. That is the only warranty term stated in this set.
The KERUI 2-pack, model MZ09, is about £12.99 with 4.4 from 12 ratings and six United Kingdom reviews of its own, not the text from the single MZ08. Bullets: two wedges, ABS and stainless plate, three sensitivity levels, 125 dB claimed, one 9V each not included, about 110 g each, and a gap of at least 8–10 mm. The item weight of 220 g fits a pair. The page warns against very smooth tile, laminate, or wood at high sensitivity, and it aims at inward-opening doors. Reviews praise the jam and the siren together, and holiday use. They also say the missing 9V nearly spoiled a trip, and that a small gap plus carpet let the door push the alarm along instead of triggering it. A larger gap worked. Rank 46 in Door Stops is the strongest Door Stops rank here, on a thin count. Warranty is not stated.
Pros
Cons
Best for: Two inward doors, or home plus a travel spare, if you buy the 9V cells with the pack and your gaps clear about 10 mm.
Less suitable: A single carpeted door with a doorsweep, or a buyer who wants the cell in the box.
Specifications
Common questions
What comes in the 2-pack?
Two wedge alarms, model MZ09. Each bullet asks for one 9V battery, not included. Item weight is 220 g and the bullet weight is 110 g each.
What gap does this KERUI page state?
At least 8–10 mm. One review found a small gap with carpet pushed the unit along, while a larger gap triggered it.
Is this the same reviews as the £8.99 KERUI?
No. B0GWGTPV8S is model MZ08 with nine reviews of its own. This 2-pack has 4.4 from 12 and six captured reviews.
The Mengshen 3-pack, part MS-M68, is about £16.99. The page shows 4.3 from 2,290 ratings and the same 50 captured United Kingdom reviews as the single B01MF5FLIY. It is one parent pool. Bullets: three sensitivity levels, wedge use when off, no installation, one 9V, 120 dB under pressure. Reviewers in that pool say the PP3 is not supplied. Dimensions are 14 x 4.5 x 3.8 cm. Item weight is 97 g, which is not explained for three units. Colour is listed as black and silver. In the shared text, loudness and holiday use are the praise, including laminate in one review and years of travel in another. Carpet, carpet-edge treads, a hotel with only one door that had a gap, a pack in which only two of three worked, and a unit that sounded as soon as it was armed are the faults. One reviewer lowered sensitivity because wind and the post set it off. Warranty is not stated. Per unit the shelf price is lower than the single only if all three work.
Pros
Cons
Best for: Home plus travel plus a spare, if you buy three PP3 cells and you test each unit.
Less suitable: A buyer who thinks 2,290 people reviewed this exact 3-pack on its own.
Specifications
Common questions
How is this different from the Mengshen single?
This is a 3-pack, part MS-M68, at about £16.99, colour listed as black and silver, size 14 x 4.5 x 3.8 cm. The single is MS-M681 at about £8.98. The 4.3 from 2,290 and the captured reviews are the same text.
Do reviewers say every unit in a 3-pack worked?
No. One captured review says only two of three worked. Another describes a unit that sounded as soon as it was switched on under the door.
What floor comments are in the shared reviews?
One reviewer says it works on laminate and wood. Others say carpet and carpet-edge treads make it useless, and one hotel stay had only one door with enough gap.
The Mengshen single is about £8.98, model MS-M681, with a title that says wireless and vibration-triggered. The bullets do not describe a receiver. They describe three sensitivity levels, a wedge that still works when the alarm is off, one 9V cell, and 120 dB when pressure is applied. The page shows 4.3 from 2,290 ratings, and the captured review text is the same pool as the 3-pack B00QIEVVKU, so it is not a separate sample for this black unit. In that pool people praise the volume, hotel use, and simple switches, and they complain that the PP3 is not supplied, that carpet and threshold strips defeat the wedge, and that units arrive dead or scream as soon as they are armed. Dimensions are 14 x 4.1 x 4.6 cm and item weight is 97 g. Warranty is not stated.
Pros
Cons
Best for: One inward door at home if you already have a 9V cell and you treat the star line as shared.
Less suitable: Anyone who read the title as a wireless sensor with a separate chime.
Specifications
Common questions
Is it a wireless alarm?
The title says wireless and vibration-triggered. The bullets describe a pressure wedge, three sensitivity levels, and one 9V cell. They do not describe a receiver.
Are the 2,290 ratings only for this single?
No. The same 4.3 from 2,290 line and the same captured review text appear on the 3-pack B00QIEVVKU. Treat them as one pool.
Does the box include the battery?
The bullet says one 9V is required. Reviewers in the shared pool say they had to buy a PP3. The attribute table does not say included.
The Jognee wedge is the lowest shelf price in this set at about £7.69, with 4.0 from 85 amazon.co.uk ratings and six captured United Kingdom reviews. The bullets claim 130 dB, a rubber base that works as a silent wedge when off, three LR44 cells, and a gap of 10 mm to 25 mm on carpet, parquet, or tile. The page does not say whether the cells are in the box, and it does not describe a sensitivity switch. Item weight is 60 g against a bullet of about 43 g. The size line is 10 x 10 x 10 mm, which cannot describe this stop, so that figure stays a conflict rather than a measurement. Two of the six reviews say the unit did not work or was returned. Others call it loud and cheap, including as a hand-held noise maker. There is no warranty line.
Pros
Cons
Best for: A cheap single wedge when you can test it the day it arrives and you already accept coin cells.
Less suitable: A trip that leaves tomorrow, or any door whose gap you have not measured.
Specifications
Common questions
What gap does the listing state?
The bullet says the distance between the bottom of the door and the floor should be 10 mm to 25 mm. The size attribute is 10 x 10 x 10 mm, which conflicts with a door stop of about 43 g to 60 g.
Which batteries does it name?
The bullet says 3 x LR44. The page does not say whether they are included. It also says the sound fading is a sign to replace the cells.
What do the captured reviews say?
Six United Kingdom reviews were captured against 85 ratings. Some call it loud and cheap. Two say it did not work or was returned as faulty.
The KERUI single, model MZ08, is about £8.99 with 3.9 from nine amazon.co.uk ratings, and all nine United Kingdom reviews are in the file. Bullets match the 2-pack idea: ABS and a steel plate, three sensitivity levels, 125 dB claimed, 9V not included, a gap of at least 8–10 mm, and a warning against very smooth tile, laminate, or wood. The bullet weight is 110 g. The item-weight line says 0.11 g, which is kept as a conflict. Reviews praise a piercing siren, hotel and student use, and grip on lino. They also say a low door slides the light wedge away, that the 9V is awkward to seat, and that the terminals may not prevent a reversed cell. One reviewer fitted the 9V and the unit became very hot and smelt of burning, and they stopped using it. That report is the reason not to treat this ASIN as a harmless spare.
Pros
Cons
Best for: A spare single only if you fit the 9V at home, reject it immediately if it warms up, and your door clears 8 mm.
Less suitable: A first security device for a trip, or anyone who will not check the cell compartment.
Specifications
Common questions
What gap does KERUI state?
The bullet says at least 8–10 mm between the door and the floor, and it advises against very smooth tile, laminate, or wood at high sensitivity.
Why is there a heat warning on this ASIN?
One United Kingdom review says the unit got very hot and smelt of burning as soon as the 9V was inserted. The reviewer links that to terminals that do not stop a reversed cell. Stop using a unit that heats up.
Which weight figure is on the page?
The bullet says 110 g. The item-weight line says 0.11 g. Both are recorded. The 0.11 g line is not treated as a correction.
The Lomuna 2-pack, model MK-MDB, is about £9.99 with 3.1 from four ratings and three United Kingdom reviews. Bullets claim 125 dB, three sensitivity levels, a rubber base on wood, tile, and carpet, a plain wedge when off, and one 9V per unit, not included. The listing size is 10 x 10 x 10 mm and the unit count says 1.0 against two pieces. One reviewer measured about 145 x 45 x 40 mm and found the siren switch is a spring touching a screw through the metal plate, with about 3 mm of travel on one side and twist on the other. That review says about 20 mm under the door is needed before the plate switches, and the thin end blocks without sounding. Another review found it loud and simple in a hotel. A third said the metal face is a poor ordinary door stop. Item weight is 220 g for the pack. Warranty is not stated.
Pros
Cons
Best for: Two rooms only after you measure a gap near 20 mm and you accept a crude plate switch.
Less suitable: A tight UK internal door, or a buyer who needs the listing dimensions to be true.
Specifications
Common questions
How much gap did a reviewer need?
One review measured the units at about 145 x 45 x 40 mm and said the door gap had to be at least about 20 mm before the metal plate could switch the siren. The listing itself gives no millimetre gap.
Are batteries included?
The bullet says one 9V per unit, not included. Reviewers confirm they are not in the box.
Why is the size line not used as the real size?
The attribute size is 10 x 10 x 10 mm. A reviewer measured about 145 x 45 x 40 mm. The listing size is kept only as a conflict.
These eight alarm door stops were scored from their amazon.co.uk listings and the United Kingdom review notes already captured for those ASINs. This is not a lab test, and a printed 120 dB, 125 dB, or 130 dB line is a claim, not a measured peak. None of the pages is treated as police-approved, Secured by Design, Sold Secure, BS 3621, or PAS 24.
Amazon evidence
35%Star rating and rating count on amazon.co.uk. A large count scores only when the written reviews belong to that ASIN. Mengshen's 4.3 from 2,290 is one shared pool across the single and the 3-pack, so it is not scored twice. A 5.0 from one rating is not scored as a sample.
Listing fit
25%A stated gap, a named cell, a sensitivity control, and dimensions that can describe a wedge. A 10 x 10 x 10 mm size line against a stop that weighs tens of grams scores down. A wireless title with no receiver in the bullets scores down. A missing gap on an otherwise coherent page scores down less than a size that cannot be true.
Review outcome
25%United Kingdom review notes that describe a working siren, a hotel night, or a gap that matched the door score up. A heat and burning-smell report, a pack with a dead unit, an instant siren, or a wedge that only slides on carpet scores down. Non-UK texts are not used as UK opinion.
Value
15%Shelf price in GBP against a wedge you can power on the night you need it. A low price does not score when captured texts say the unit was faulty, or when the cell is missing and the review file is tiny. The best-value place is the best price among wedges with their own review text, a stated gap, and no heat report.
Eight wedges, one decision. The top pick is the TECKNET TK-HA003 if you will charge a USB-C cell before you travel. The best value is the KERUI MZ09 2-pack if you want two units, your gaps clear about 8–10 mm, and you will buy the 9V cells with the pack. Everything cheaper in this set either shares a review pool, has a heat report, or has a thin or mixed fault file. A printed decibel figure was not measured here. None of these pages is a lock, and none of them may prop a fire door.
An alarm door stop, among the eight amazon.co.uk listings kept for this comparison, is a plastic wedge you put on the floor inside an inward-opening door. A push both resists the door a little and sets off a siren. People use them for hotel rooms, spare bedrooms, and nights alone. They are a noise if the door moves. They are not a lock, and they are not a legal way to hold a fire door open. The wedge only loads if the door opens towards the room.
KERUI, Mengshen, and Lomuna need a 9V that is not in the box. Jognee does not say the LR44 cells are included. TECKNET must be charged first, and reviewers say that takes longer than one hour. Buy or charge the cell before you leave.
The single B01MF5FLIY and the 3-pack B00QIEVVKU show the same 4.3 from 2,290 and the same captured review text. That is one pool. The pack difference is three wedges, not a second crowd of reviewers.
GOV.UK fire-door checks include doors wedged open, and the closer must shut the door. You must still be able to leave the room at once. A guest wedge is not an alarm-linked hold-open to BS 7273-4.
The wedge only works if the door opens into the room. On an outward-opening door the stop never takes the load, so the siren never sees a push. Measure the gap under the door before you compare prices. In this set, KERUI states at least 8–10 mm on both the single MZ08 and the MZ09 2-pack. Jognee states 10–25 mm. Lomuna's listing gives no millimetre gap; one reviewer measured about 20 mm before the metal plate switched, and said the thin end of the wedge can block the door without sounding.
You need a cell that is already in the wedge on the night you need it. TECKNET TK-HA003 is the only USB-C model here. The bullet says about one hour of charge and up to three months, with a low-battery alert of three beeps and three flashes. Captured reviews say charging took about two hours or a few hours, and one cable was called very short. If the cell is flat and you have no cable, it is a silent piece of plastic.
Three typical situations, each with a recommendation from this comparison.
You want one small wedge for hotel rooms and you can charge it at home before you leave. The TECKNET TK-HA003 uses USB-C, so you are not hunting for a 9V at the airport. Charge it fully: reviewers report longer than the one-hour bullet.
You want a pair for home plus a spare, your gaps clear about 8–10 mm, and you will buy the 9V cells with the pack. The KERUI MZ09 2-pack has its own 4.4 from 12 ratings and no heat report in the captured reviews.
You already accept 9V cells and you will test every unit before you rely on it. The Mengshen 3-pack is three wedges at about £16.99. Treat the 4.3 from 2,290 as the same pool as the single, not as a second crowd.
The top pick is the TECKNET TK-HA003. It has the highest score because 4.4 from 557 ratings is its own amazon.co.uk pool, it charges by USB-C, and the listing states a sensitivity roller plus a 36-month warranty if you register. The best value is the KERUI MZ09 2-pack at about £12.99: two wedges, their own 4.4 from 12, a stated gap of at least 8–10 mm, and no heat report in the captured reviews. Cheaper singles were not given that place. Two of six captured Jognee texts say faulty or returned, and the KERUI MZ08 single has a heat and burning-smell report. None of the eight locks the door.
KERUI door stop, 2-pack
Best price among wedges with their own review text, a stated gap of at least 8–10 mm, and no heat report. The cheaper KERUI single is blocked by a heat report.
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 for the safety and standards points. Product prices, stars, and review notes are from the amazon.co.uk listings. Shelf date 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. If you buy through them, we may earn a commission at no extra cost to you. Prices, stars, and review notes come from amazon.co.uk listings and the public UK sources below. This is not a lab test.
